Untersuchung zur E/p-Kalibration des Kalorimeter-System am ATLAS ... [PDF]

Untersuchung zur E/p-Kalibration des Kalorimeter-Systems am ATLAS Detektor

Bachelorarbeit zur Erlangung des Grades eines Bachelor of Science in Physik

vorgelegt von

Carsten D. Burgard aus Denzlingen

Themenstellung: Prof. Dr. Karl Jakobs

Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg im Breisgau 2011

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CONTENTS

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Contents 1 Abstract

1

1.1

Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

1.2

Zusammenfassung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

2 Introduction

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3 Experimental facilities

4

3.1

The LHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

3.2

ALICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

3.3

LHCb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

3.4

CMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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3.5

ATLAS

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Measuring jets

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4.1

How do particles interact with matter . . . . . . . . . . . . . . . . . . . . .

4.2

The calorimeter system of ATLAS . . . . . . . . . . . . . . . . . . . . . . . 11

4.3

Jet Energy Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.4

E/p measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.5

Background subtraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5 Improving the background subtraction

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18

5.1

Definition of the terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2

Discussion of the central detector region . . . . . . . . . . . . . . . . . . . 20

5.3

Discussion of the forward and backward detector regions . . . . . . . . . . 23

6 The parametric approach

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6.1

Derivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.2

Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7 Results 7.1

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Results on E/p measurements . . . . . . . . . . . . . . . . . . . . . . . . . 39

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CONTENTS

7.2

Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

7.3

Outlook . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

References

v

List of Figures

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A The ATLAS coordinate system

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B Monte Carlo Simulation

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C Collection of all plots

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C.1 Energy deposition density . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 C.2 Linear approximation of the energy deposition density . . . . . . . . . . . . 55 C.3 Linear approximation of the energy deposition as a function of track momentum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 C.4 Comparison of jet energy deposition density for wide and narrow jets (radial RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 C.5 Background estimation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 C.6 E/p plots, former correction factor . . . . . . . . . . . . . . . . . . . . . . 88 C.7 E/p plots, new correction factor . . . . . . . . . . . . . . . . . . . . . . . . 90 C.8 Comparison of background estimations for both correction factors . . . . . 92

1 ABSTRACT

1 1.1

1

Abstract Abstract

The accurate knowledge of the Jet Energy Scale is a dominant factor for the vast majority of precision measurements and new physics searches at the LHC. A key component for this is the measurement of the single hadron response of the calorimeter, a problem usually adressed through E/p measurements. In this thesis, we critically review this √ approach, making use of s = 7 TeV proton-proton collision data collected by the ATLAS experiment in 2010. In the past, late showering hadron tracks were successfully used to directly measure the background originating from neutral particles in the periphery of the track, assuming a constant contribution superimposed to the MIP track itself. In this thesis, we extrapolate the background contribution superimposed to the charged hadron track by assuming a linear dependency of the energy deposition density of the distance from the charged track. Concluding that, although the previously used estimation method does not agree with the actual deposition density measured, the assumption used previously underestimates the background on the E/p observable by only 10% due to geometrical reasons.

1.2

Zusammenfassung

Die genaue Kenntnis der Jet Energy Scale des Kalorimeter-Systems ist ein bestimmender Faktor für nahezu alle Präzisionsmessungen und Suchen nach neuer Physik an Hadronenbeschleunigern wie dem LHC. Eine Schlüsselrolle hierbei nimmt die Messung der single hadron response des Kalorimeters ein. Hierzu ausgeführte E/p-Messungen werden im Hinblick auf mögliche Fehler durch systematische Unterschätzung des durch neutrale Teilchen verursachten Untergrunds untersucht. Ereignisse, in denen geladene Hadronen erst spät elektromagnetische Schauer auslösen, werden verwendet, um den peripheren Untergrund direkt zu messen. Die bisher zur Abschätzung des Untergrunds verwendete Annahme eines konstanten Untergrunds im Bereich der geladenen Spur selbst wird untersucht. Als neue Methode der Abschätzung wird eine lineare Extrapolation der Energiedepositionsdichte vorgestellt. Obwohl die bisher verwendete Annahme die wahre Dichte der Energiedeposition nicht gut wiedergibt, liefert auch die neue Extrapolationsmethode nur etwa um 10% höhere Abschätzungen des Untergrundes. Dies kann durch geometrische Überlegungen erklärt werden.

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2 INTRODUCTION

Introduction

Ever since, mankind has tried to understand the forces of nature, that drive and hold together the world as we know it. Within the last century, however, this search has advanced vastly, which would not have been possible without the combination and close interplay of both theory and experiment. But the further this search continues, the more complex, elaborate and expensive the experiments become that are necessary to test the theories proposed to explain the nature of matter and interactions. One of the greatest successes in the course of this quest was the introduction of the Standard Model of particle physics, providing a consistent theory for particles and interactions and making predictions that could be verified experimentally to high precision. There are, however, hints that the standard model, although extremely successful, might not be the full picture. Many theories exist, trying to explain phenomena that cannot be explained within the standard model, among which are fundamental questions like the asymmetry of matter and antimatter observed in our universe, the nature of dark matter and other, more involved phenomena. Experiments have to be planned and performed in order to test these theories and provide observations, eventually leading to their verification or falsification. State-of-the-art experiments in particle physics, designed to push the limits of our understanding of the fundamental particles and their interactions further, are nowadays no longer projects of single, brilliant scientists, but rather the outcome of large collaborations of scientists and technicians, accurately designed and built over timescales of years and decades. Particle physics experiments can roughly be divided into two categories: Astro particle physics experiments and collider experiments, the former looking for high-energy particles from space, the latter trying to produce them with particle accelerators. Each of these fields has its own unique advantages and disadvantages, and again only the combination of all observations from both fields can provide a fully consistent picture. Astro particle experiments benefit from the fact that, in cosmic events such as supernovae, particles with energy ranges vastly exceeding the range of man-made accelerators are produced. The observation of such particles is, however, comparably rare, and since the production does not happen under laboratory conditions, but many lightyears away from the earth, the aquisition of data sufficient to provide experimental proof for theories relies heavily on a long time of observation and sometimes even on luck. Accelerator experiments, on the other hand, have the advantage of producing high energy particles with a sufficient rate to provide large amounts of data. Furthermore, the observations can be made under reproducible conditions, ideally with a full coverage and observation of all produced particles for the single event. Then, again, these experiments rely on accelerators, which

2 INTRODUCTION

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are costly and limited in the range of accessible energy. The ATLAS detector is one of the four main detector experiments at the LHC, the world’s largest particle accelerator to date (2011), providing insight to energy regions previously unaccessible to collider physics. Its calorimeter system is complex, consisting of several layers and different modules. The design was optimized for high performance precision energy measurements of high energy particles emerging the collisions. The proper calibration of this system requires detailed investigation of various effects as well as the calculation and estimation of various backgrounds and correction factors. One of the most challenging tasks in the calibration procedure is the determination of the Jet Energy Scale (in the following JES), that is, the calorimeters response to hadronic jets. Jets are produced in great numbers at the LHC, since the cross sections for processes of the strong interaction are by far dominating all other possible interactions, and hadronic jets are the typical products of these interactions. A precise measurement of the jet energy is, however, difficult, as will be discussed in further detail in this thesis. Therefore, uncertainties on the JES are the dominant systematic uncertainties for many precision measurements and new physics searches at the ATLAS detector. One way to measure the calorimeter JES and its uncertainty is to combine the measurements from the calorimeter with tracking information from the inner detector. Based on the two corresponding quantities, the energy E measured by the calorimeter and the track momentum p measured by the inner detector, a calibration of the calorimeter response to single hadrons can be performed by considering their ratio E/p. The single particle response can then be convoluted with the predicted jet structure to derive the JES. In this thesis, we will discuss and investigate estimation methods for the background to measurements of the single hadron response, originating from neutral particles. We will also present a possible improvement of these methods based on measurements of the shape of this background. We propose an approach to parametrize this shape in a linear way, leading to new and slightly larger correction factors applied to the measured background. We also present large-scale experiemtal results, demonstrating the advantages of our method.

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3 EXPERIMENTAL FACILITIES

Experimental facilities The LHC

The Large Hadron Collider (LHC) is currently (as of 2011) the worlds largest and highestenergy particle collider. It is operated by the European Organization for Nuclear Research or CERN (Organisation Européenne pour la Recherche Nucléaire, formerly Conseil Européen pour la Recherche Nucléaire) and located in a particle physics laboratory northwest of Geneva, also often referred to as “CERN”. The LHC itself is a synchrotron, a special type of circular particle accelerator (as opposed to linear accelerators) and has a circumference of approximately 26.7 km. It was built underground in the tunnel of the former Large Electron-Positron Collider (LEP), which was shut down and deconstructed in 2000 in order to make room for the LHC.

Figure 1: CERN overview and LHC tunnel

The LHC itself mainly consists of 1 232 superconducting dipole magnets with a nominal magnetic field strength of up to 8.3 T. Two beams of protons counter-rotate in the LHC ring in opposite directions. Unlike particle-antiparticle colliders, where the opposite beams can share one ring due to their opposite charge, the high design luminosity of 1034 cm−2 s−1 made the use of anti-protons impractical. Thus, also due to consideration of the limited space in the tunnel, a twin bore magnet (or “two-in-one”) design for the superconducting ring magnets was chosen. Both beams are split into a great number of bunches (up to 2 808 each) of approximately 1010 protons each. One of the main features of the LHC is the high kinetic energy of these protons. The collider was designed for a beam energy of 7 TeV, and although this energy will not be reached until 2014, the current beam energy of 3.5 TeV still makes the LHC the highest-energy man made particle accelerator ever built. The interested reader

3 EXPERIMENTAL FACILITIES

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may, however, refer to [8] for more details on the LHC machine. At four different places on the ring, the proton beams intersect. These intersection points are located within large particle detectors, forming so-called “experiments”. Each of these four experiments is operated by an international collaboration of scientists and technicians, and each of the detectors was designed in a unique way in order to fit the needs of the special purpose of the particular experiment. Two of these experiments, ATLAS and CMS, located on opposite sides of the ring, can be viewed as omni-purpose detectors, whilst the other two, ALICE and LHCb, concentrate on rather specialized fields of research. A number of other, much smaller experiments is sharing the intersection points with the four mentioned above. The purpose and the design of all four main experiments will be briefly discussed in the following, although there will be a strong focus on the design of the ATLAS detector, the details of which will become one of the main aspects of this thesis.

3.2

ALICE

Apart from the collision of protons, the LHC is also capable of accelerating heavy ions. The analysis of these collisions is the main research field of ALICE (A Large Ion Collider Experiment), the only one of the four large LHC experiments designed specifically to adress the physics of strongly interacting matter, to investigate quantum chromo-dynamics and especially to examine the physical properties of quark-gluon-plasma, a state of matter in which quarks and gluons behave as quasi-free objects. The ALICE collaboration includes over 1 000 physicists and engineers from 105 institutes in 30 countries. The ALICE detector itself has overall dimensions of 16 × 16 × 16 m3 with a total weight of approximately 10 000 t and consists of two main parts. The first one is the central barrel, which measures hadrons, electrons and photons and is embedded in a large solenoid magnet reused from the LEP L3 experiment, while the other one is the forward muon spectrometer. From the inside out, the central barrel consists of an Inner Tracking System of six planes of high-resolution silicon pixel-, drift- and strip-detectors, a cylindrical TimeProjection Chamber, three particle identification arrays of Time-of-Flight, Ring Imaging Cherenkov and Transition Radiation detectors, and two electromagnetic calorimeters. Detailed information on ALICE can be found in [9].

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3.3

LHCb

The main aim of the LHCb experiment is a precision analysis of the physics of heavy flavour hadrons, especially charmed c and beauty b hadrons (the latter accounting for the experiments name). Rare decay modes of these and precise measurements of their branching ratios may be used to investigate the mechanism of CP violation and to crosscheck the CKM-theory of this mechanism, which has, up to now, proven to hold with great precision [14, 15]. The standard model CP violation mechanism can, however, not explain the imbalance of matter and antimatter observed in our universe, and so many beyond-standard-model theories contain extensions of this mechanism. Since the differential production cross section for heavy hadrons is largest in the forward and backward regions, the LHCb detector is essentially a single-arm spectrometer located in the forward region of the experimental site. It has highly flexible trigger systems as well as superior vertex reconstruction capability in order to identify and investigate the short-lived B-mesons with high precision. For this experiment, it is also possible to reduce the luminosity in order to reduce pile-up and improve the data quality by slightly defocussing the beam at the LHCb collision point. The LHCb collaboration consists of approximately 760 scientists and technicians from 54 institutes, representing 14 countries. For further information, the reader may refer to [10].

3.4

CMS

The CMS (Compact Muon Solenoid ) experiment is one of the two omni-purpose detector experiments operating at the LHC. The spectrum of research objectives is wide and contains amongst others the • search for the Higgs boson and thus the verification (or falsification) of the Higgsmechanism of electroweak symmetry breaking • experimental check of the (mathematical) consistency of the Standard Model of particle physics at the TeV energy scale • search for experimental groundings for different “beyond-Standard-Model” theories such as Supersymmetry or a “Grand Unified Theory” (GUT) Whether these ambitious goals will finally be achieved by the CMS collaboration and experiment, the next years will show. The detector itself is equipped to be sensitive to a wide variety of physical processes in order to allow the simultaneous study of the theories and effects mentioned above.

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The main (and name-giving) part of the detector is a 4 T superconducting solenoid, providing sufficient bending power to allow a high momentum resolution on ultra-high energy particles. The bore of the magnet coil is with a diameter of 2.6 m large enough to contain the inner detector, consisting of ten layers of silicon microstrip detectors and three layers of silicon pixel detectors close to the interaction point as well as a lead tungstate crystal electromagnetic calorimeter and a brass/scintillator hadronic calorimeter. Outside the magnet coil, the muon chambers are located, which play a central role in the detector concept and also contributed to the detector’s name. With a total length of 21.6 m, a diameter of 14.6 m, a total weight of approximately 12 500 t and a collaboration with over 3 600 participants from 183 different institutes in 38 countries, the CMS experiment is one of CERN’s main research facilities for the search for new physics and tests of the Standard Model. More information on the CMS experiment and further technical descriptions of the detector (and its concept) can be found in [11].

3.5

ATLAS

The ATLAS (A Toroidal LHC ApparatuS ) experiment is the second omni-purpose detector experiment at the LHC. Since the ATLAS detector is subject to the work of this thesis, we will discuss the technical details of it to some extent. For any further information, however, the reader may refer to [12]. As the two experiments ATLAS and CMS were designed in a complementary manner, their agenda and research purposes are equal to a large extent. Hence, the reader may refer to Section 3.4 for a brief discussion of the physical phenomena which are subject to the research performed by the ATLAS collaboration. Approximately 2 000 scientists from 165 institutes in 35 countries participate in this research. The ATLAS detector, as depicted in Figure 2, has a cylindrical layout and is nominally forward-backward-symmetric. Among the main (and name-giving) design features are the three large superconducting toroid magnets, arranged in an eight-fold azimuthal symmetry, surrounding the calorimeters (one barrel and two end caps). The inner detector of ATLAS is contained within a 2 T solenoid magnet and is composed of three detector-subsystems. The innermost layer of detector material is the silicon pixel detector, consisting of three layers of silicon pixel cells, close to the central interaction vertex. Proceeding outward, four double-layers of silicon microstrip (SCT) detectors follow, completing the semiconductor tracker. The third component of the inner detector right before the solenoid is the transition radiation tracker (TRT), a thick layer of polymide drift (straw) tubes. The ATLAS calorimeters are located outside the inner detector. The inner, electro-

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magnetic calorimeter is divided into forward-backward a barrel part as well as two with end-caps and The ATLAS detector is nominally symmetric respect to isthedesigned interacas a sampling calorimeter with lead as the absorber and liquid argon as the active matertion point. The magnet configuration comprises a thin superconducting solenoid surrounding the ial. The electrodes as well as the absorber plates offer a unique, accordion-shaped design inner-detector cavity, and three large superconducting toroids (one barrel and two end-caps) arin order toan provide full azimuthal azimuthalsymmetry symmetry without interrupting This cracks. ranged with eight-fold around the calorimeters. fundamental choice has driven the design of the the rest of the calorimeter, detector. The next layer is hadronic using steel absorbers and scintillating tiles The inner detector is immersed in a 2 T solenoidal field. Pattern recognition, momentum in the barrel region and again liquid argon with plates of copper as absorber material and vertex measurements, and electron identification are achieved with a combination of discrete, in the end cap. The ATLAS calorimeter system will be discussed in further detail in high-resolution semiconductor pixel and strip detectors in the inner part of the tracking volume, Section 4.2. and straw-tube tracking detectors with the capability to generate and detect transition radiation in its outer Thepart. outermost detection layer is the muon chamber system, which mainly consists of High granularity (LAr) electromagnetic samplingofcalorimeters, excellent monitored drift tubesliquid-argon and is based on the magnetic deflection muon trackswith in the large performance in terms of energy and position resolution, cover the pseudorapidity range |η| < 3.2. superconducting toroid magnets. The hadronic calorimetry in the range |η| < 1.7 is provided by a scintillator-tile calorimeter, which is separated into a large barrel and two smaller extended barrel cylinders, one on either side of the central barrel. In the end-caps (|η| > 1.5), LAr technology is also used for the hadronic calorimeters, matching the outer |η| limits of end-cap electromagnetic calorimeters. The LAr forward calorimeters provide both electromagnetic and hadronic energy measurements, and extend the pseudorapidity coverage to |η| = 4.9. The calorimeter is surrounded by the muon spectrometer. The air-core toroid system, with a long barrel and two inserted end-cap magnets, generates strong bending power in a large volume within a light and open structure. Multiple-scattering effects are thereby minimised, and excellent muon momentum resolution is achieved with three layers of high precision tracking chambers.

–4–

2008 JINST 3 S08003

Figure 2: ATLAS length detector. 44 m, radial 25 m, weight 7 000 Figure 1.1: Cut-away viewDetector, of the ATLAS Thedim. dimensions of theapprox. detector are t.25 m in Reproduced from [12] with kind permission from IOP Publishing. height and 44 m in length. The overall weight of the detector is approximately 7000 tonnes.

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9

Measuring jets

The LHC is a proton-proton collider. The actual collisions, however, happen between the constituents of the protons, that is quarks of different flavours and gluons. As opposed to lepton colliders, processes at hadron colliders are therefore dominated by the strong interaction. In high energy collisions, a large number of strongly interacting particles is produced in every collision. These objects travel away from the interaction vertex with high velocity, possessing enough energy to overcome the confinement barrier and create new particles to form composite objects, a process usually referred to as hadronization [14, 15]. Large numbers of hadrons emerge from the primary vertex, their momentum being almost aligned with respect to the momentum of the original particle produced in the collision. The angular range under which these objects emerge is usually small due to the high momentum of the original product and relativistic effects. Jet production processes are not only subject to direct research, but also contribute as a major background to many other measurements. Therefore, a high precision in the measurement of jets is of great interest.

4.1

How do particles interact with matter

In this section, we briefly discuss the different ways of particles to interact with matter, such as the material of the calorimeter. We will especially focus on the interaction of high energy particles with the electromagnetic calorimeter of ATLAS, which is subject to our investigation, and we will also briefly discuss the physical effects arising in the detection of jets. A full coverage of the mentioned effects, however, vastly exceeds the scope of this thesis. For a comprehensive and detailed description of all effects related to the calorimetric measurement of particles, the reader may refer to [13]. Apart from weak interactions, which play a minor role for calorimetric purposes, the possible interactions of particles with matter can roughly be divided into two categories: electromagnetic interactions and strong interactions. While the former play a role for all charged particles and photons, the latter are only important for hadrons, such as baryons and long-living mesons. Some important examples for electromagnetic interactions are listed below. • Charged particles traversing matter interact with the electromagnetic field generated by the nuclei of the surrounding material, losing their energy by the emission of photons. This process called bremsstrahlung is by far the dominant process for light particles with very high energy. In practice, bremsstrahlung only plays a role for the measurement of electrons.

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• Photons of sufficiently high energy may interact with the electromagnetic field of the nuclei generating electron-positron-pairs. This process is called pair production. Photons with an energy lower than twice the electron mass cannot undergo this process. • Any particle participating in the electromagnetic interaction may interact with the electrons of the material by undergoing elastic scattering, exciting the interaction partner to a higher energy level or depositing enough energy to ionize the atom with which it interacted. Clearly, these processes result in the multiplication of the number of free particles, setting free electrons or producing electron-positron pairs, or photons through a variety of different processes. For particles of sufficient energy, where the former two processes play a significant role, one therefore typically speaks of particle showers induced by the original particle, through which the energy is finally deposited in the detector material. Since electrons (or positrons) and photons may undergo subsequent alternating conversions, the electromagnetic shower profiles of these particles are fairly similar. Comparing this to processes of the strong interaction, such as • scattering with associated production of mesons • spallation of nuclei • excitation of nuclei with subsequent radiation of nucleons or photons it is clear that one will also find shower development here. It has to be noted though, that while the development of electromagnetic showers can be understood in a relatively simple manner, the details of the hadronic shower development are complex. This is mainly due to the following reasons: • Some mesons such as neutral pions will almost immediately decay into photons, thus inducing electromagnetic showers superimposed to the hadronic shower. Charged mesons on the other hand will typically travel long distances before undergoing a further hadronic interaction. These two factors together make hadronic showers highly irregular and inhomogeneous. • Depending on the details of the shower development, a large number of relatively soft (i.e. low-energy) neutrons will be produced. The dominant (if not only) interaction process for such neutrons with the detector material is elastic scattering, which will (because of the mass difference between single soft neutrons and atomic nuclei) only account for low energy losses in every single interaction. This will cause the energy

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to spread widely over the detector, the deposition taking a considerable amount of time. Hence, this energy will be practically lost for detection purposes. Obviously, the relative importance as well as the total outcome of these effects depend on the material as well as on the concept of the detector, and also on the type and the energy of the particle inducing the shower. In order to be able to quantify the properties of calorimeters in a (relatively) material-independent way, one chooses to define the radiation length X0 (for electromagnetic interaction) and the interaction length λ0 (for strong interaction). Although a precise definition of these quantities (as found in [13]) is beyond the scope of this thesis, both can be described in an approximate manner as the typical length scale over which a particle taking part in the associate interaction will deposit two thirds of its energy in the detector material because of radiation processes or nuclear interactions only, respectively. From a phenomenological point of view, the main difference between hadronic showers and purely electromagnetic showers is that the former are much larger in the lateral as well as in the longitudinal dimension. Therefore, electromagnetic calorimeters typically need less material for a sufficient shower coverage, or from another point of view: the electromagnetic radiation length of a material is typically much shorter than the hadronic interaction length of the same material. Due to the different ways of interaction, the transformation of energy from the hadronic to the electromagnetic sector of the deposition during the shower development and the invisible energy deposition through detachment of nucleons from the nuclei of the detector material, the calorimeter response to incoming hadrons is non-linear with the hadron energy (and is in particular lower than that of an electron of equivalent energy). Some calorimeters are thus designed to be compensating, that is, in a way such that a linear hadron response is recovered. This is typically achieved by doping the calorimeter material with radioactive materials that emit neutrons (e.g. 238 U). This is, however, not the case for the calorimeter system of ATLAS. Especially problematic is the calorimetric measurement of jets. A jet consists of a number of hadrons, typically mesons, a large fraction of which might be neutral pions, almost immediately decaying into photons. The measurement of jets is difficult, as they are not single but composite objects, and will be discussed in further detail.

4.2

The calorimeter system of ATLAS

The calorimeter system of ATLAS, of which an overview was already given in Section 3.5 in the course of a short presentation of the ATLAS detector, will be explained in further detail here. We will, however, concentrate on the more central detector regions, devoted

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to precision physics. All of this information and further details on the calorimeter system for all detector regions may be found in [12].

Figure 3: The ATLAS Calorimeter System. Reproduced from [12] with kind permission from IOP Publishing.

The calorimeter system closer to the central vertex is the electromagnetic calorimeter, which will also be the main focus of this thesis. It is divided into a barrel part (for |η| < 1.475)1 and two end-cap components (for 1.375 < |η| < 3.2). The barrel calorimeter consists of two identical half-barrels with inner and outer radii of 2.8 m and 4 m respectively and a length of 3.2 m as well as a weight of 57 t each, separated by a small gap of 4 mm. Each end-cap calorimeter is divided into two wheels, the outer of which is covering a more central pseudorapidity region (1.375 < |η| < 2.5), whilst the inner wheel covers the more forward and backward regions (2.5 < |η| < 3.2). All parts of the electromagnetic calorimeter use lead as the absorber material and liquid Argon as the active medium. The lead absorber plates (thickness varies between 1.13 mm and 2.2 mm as a function of η) are folded in a special, accordion-shaped design in order to provide full and completely symmetric azimuthal coverage. Additional, thin (approximately 0.2 mm) sheets of stainless steel to both sides of each lead plate provide additional mechanical strength of the construction. For the region of |η| < 2.5, the calorimeter is divided into three lateral sections. In the region of |η| < 1.8 an additional liquid argon layer of 11 mm depth acts as a presampler detector, used to correct for the 1

The ATLAS coordinate system and the definition of the pseudorapidity η is given and explained to some extent in appendix A.

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energy lost by electrons and photons upstream of the calorimeter. The first layer of the calorimeter is read out from the front, whereas the second and third layers are read out from the back. The total thickness of the absorber material in the electromagnetic calorimeter varies in the range of (22 − 33) X0 (radiation lengths) as a function of η for the more central detector regions. The second calorimeter system of ATLAS is the hadronic tile-calorimeter. It covers the region of |η| < 1.7 and is subdivided into a central barrel (for |η| < 1.0) and two extended barrels (for 0.8 < |η| < 1.7), with a length of 5.8 m and 2.6 m each, respectively. Here, the absorber material is steel, while the active medium is plastic scintillator. Each barrel consists of 64 modules or wedges, made of steel plates and scintillating tiles. The total depth of the tile calorimeter is approximately 7.4 λ0 (interaction lengths). The hadronic end cap calorimeter is again a sampling calorimeter, using liquid argon as the active medium and plates of copper as absorber material, covering the forward and backward regions of the detector (1.5 < |η| < 3.2). Each of the end cap calorimeters is subdivided into two wheels, a front wheel and a rear wheel, each of which consists of 32 identical wedge-shaped modules. The modules of the front wheels are made of 24 copper plates, each 25 mm thick, plus a 12.5 mm thick front plate. In the rear wheels, the sampling fraction is coarser with modules made of 16 copper plates, each 50 mm thick, plus a 25mm thick front plate.

4.3

Jet Energy Scale

As mentioned in Section 4, the ability to measure jets with high precision is crucial especially at hadron colliders such as the LHC. A quantity called Jet Energy Scale (in the following JES [1]) is therefore defined and used as a correction factor in order to correct the calorimeter response to jets. The importance of a precise knowledge of the JES factor is especially due to the fact that the JES uncertainty is the dominant experimental error on a number of important measurements, such as • the di-jet cross section • the top quark mass measurements • new physics searches with jets in the final state The JES, typically defined as RJES =

pEM-meas. T . ptrue T

(1)

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is usually calculated from Monte Carlo simulations, since the true energy of a jet is a priori unknown. Here, ptrue denotes the true transverse momentum of the jet and T EM-meas. pT denotes the energy (or momentum) measured by the detector on reconstructed information level. However, any inaccuracy in the details of the simulation will directly affect the Jet Energy Scale. This applies to the simulation of the jet itself on truth level, e.g. the composition of the jet of different hadron types, as well as to the detector simulation, e.g. modelling of the single hadron response of the detector. The latter includes effects such as • calorimeter non-compensation, i.e. the different (lower) response of the ATLAS calorimeter to hadrons. • energy losses in inactive (dead) material regions of the calorimeter, such as supply shafts or electronic material • leakage, i.e. particles (jets) not fully contained in the calorimeter • inefficiencies of the clustering algorithm or the calorimeter jet reconstruction Clearly, one cannot expect the simulation to model all those effects with absolute accuracy. A precise in-situ measurement of the JES based on real collision data is therefore subject to intense physical research (see, e.g., [1, 2, 3, 4]). One possible approach for a measurement of the JES relies on the E/p-measurement. These measurements will be discussed in the next section.

4.4

E/p measurements

The ratio between the energy E deposited by an isolated track in the calorimeter and its momentum p is an observable that can be used to assess the quality of the Monte Carlo simulation of calorimeter energy deposits. The E/p measurements make use of the excellent resolution of the inner detector silicon tracker (especially for low energy charged particles). For calibration purposes, it is useful to define a quantity usually reffered to as E/p and defined as E/p =

E meas. pmeas. ID

where pmeas. denotes the track momentum information measured by the inner detector ID silicon tracker. The quantity E meas. is calculated from the sum of all the energy reconstructed making use of a topological clustering algorithm and associated with the track.

4 MEASURING JETS

15

The purpose of the topological clustering algorithm is to identify areas of connected energy deposits in the calorimeter, based on the significance of the energy deposits in cells with respect to the expected noise level. A topological cluster is initiated by cells with an energy deposit |Ecell | > 4σnoise , where σnoise is the root mean square deviation of the electronic noise in the cell. Then, iteratively, the cluster expands adding all neighboring cells with |Ecell | > 2σnoise . Finally, the cells surrounding the resulting cluster are added, regardless of their energy [2]. The association of the cluster to an isolated track is based on the energy weighted cluster position in the calorimeter layer and a geometrical extrapolation of the track to this layer. A more detailed explanation can be found in [2]. A track is considered isolated in this context, if its impact point in the electromagnetic calorimeter has a distance of ∆R ≥ 0.4 from the closest other track impact point (see also [3]) where R is defined in terms of angle φ in the transverse plain and pseudorapidity η. A proper definition of these quantities and further details on the ATLAS coordinate system can be found in the appendix A. The value of the other quantity E meas. involved in the definition of the E/p observable is given as the sum of all topoclusters within a distance of ∆R ≤ 0.2 from the track hit in the calorimeter. Plots from E/p measurements as performed in [3], showing the dependency of hE/pi as a function of track momentum p for all pseudorapidity regions can be found in appendix C.6. The energy within this cone around the charged track can in principle be contaminated by the showers induced by close-by particles produced in the proton-proton collision, although the track isolation requirement suppresses possible shower contamination from charged particles. There is, however, no obvious way to suppress shower contamination from photons, mostly produced in π 0 → γγ decays, and neutral hadrons [3]. In the following (see Sections 6.1 and 6.2), we will develop and discuss a procedure of improving these measurements by the development of an improved method for the estimation of these neutral contributions to the total energy deposition, based on a comparison of LHC data and Monte Carlo samples generated with PYTHIA [5], on reconstructed as well as on (GEANT 4 [7] hits) truth information level.

4.5

Background subtraction

As stated before, the subtraction of the background from neutral particles to the calorimeter response requires further investigation. The background subtraction procedure

16

4 MEASURING JETS

applied in the past will briefly be discussed here, the improvements made within the scope of this thesis explained and discussed in the following sections (see 6.1, 6.2). The background subtraction method is based on the idea that the energy deposited in the electromagnetic calorimeter by contaminating photons and hadrons accompanying the track subject to the investigation is independent of the details of the hadronic shower induced by the track. Therefore, one can select events where the charged track hadron behaves like a minimum ionizing particle (in the following short MIP), that is, select tracks that induce a late hadronic shower, in the following referred to as MIP-tracks. A track is considered a MIP track if • the energy deposited in the electromagnetic calorimeter within a cone of r < 0.1 is smaller than 1.1 GeV • the fraction of energy deposited in the hadronic calorimeter with respect to the track momentum is between 0.3 and 0.9 Excluding a small region around the MIP track itself, all of the energy released in the electromagnetic calorimeter in the periphery of the track will (due to the track isolation requirement explained in Section 4.4) originate from showers of neutral particles. The background can therefore be measured in a halo around the MIP track itself, and its mean value over many events in a given pseudorapidity and momentum bin can thus be used as an estimate for the background energy deposition in all hadronic events. This procedure, as proposed in [3], however, has a substancial weakness: while the background estimate for halo region around the MIP track leads to satisfying results, the background in the central cone of r = 0.1, e.g. the innermost cone used for the MIP 0.2 selection criterium itself, cannot be estimated directly. Instead, a correction factor R0.1 was used to correct the result of the background estimate. This correction factor was defined as 0.2 EEM 0.2 0.1 EEM − EEM A0.2 ≈ 0.2 A − A0.1

0.2 = R0.1

(2) (3)

where Ar corresponds to the base surface of a cone with radius r. In the special case considered above, the correction factor can be evaluated directly to yield the value of 4/3. Clearly, this approximation is equal to the assumption of a “flat” distribution of the background energy deposition density ρ (r) around the charged hadron track, such that ρ (r) at a distance r from the track has a constant value ρ0 , only depending on the track

4 MEASURING JETS

17

momentum p and the pseudorapidity bin (or detector region), hence ρ (r) ≈ ρ0 .

(4)

This approximation might hold for low momenta of the charged hadron track, but is questionable especially when a jet-like structure starts to evolve, i.e. for high track momenta. This can also be seen from the plots in the appendix C.5. Therefore, we will elaborate on finding a better approximation (see 6.1, 6.2).

18

5 IMPROVING THE BACKGROUND SUBTRACTION

5

Improving the background subtraction

As discussed in the previous sections, a precise measurement of the JES is crucial for many applications. For an E/p measurement, the ratio between the track momentum measured by the inner detector and the corresponding signal from the electromagnetic calorimeter is calculated. Contamination of the calorimeter signal from charged particles is avoided by imposing a track isolation requirement onto the considered tracks. However, contamination originating from neutral particles such as photons (e.g. from neutral pion decays) cannot be avoided and must be estimated. Hence, tracks considered as MIP tracks are taken into account. For these tracks, the energy deposition from the charged track considered is sharply localized to an area close to the track itself. Therefore, such events can be considered in order to extrapolate from the measured energy density in a halo cone around the track to a background estimate for the full cone area. The correction factor as defined in Section 4.5 is naturally the ratio of the energy deposition in the full 0.2 cone of r = 0.2 with respect to a halo cone with 0.1 < r < 0.2, and is denoted by R0.1 in the following.

5.1

Definition of the terminology

0.2 In order to achieve an explicit expression for R0.1 or, alternatively, the average elec0.2 tromagnetic background energy E as a function of the track momentum p directly, large samples of Monte Carlo data on reconstructed information level, passed through a GEANT 4 simulation of the detector response (see also appendix B), including noise and digitization of the signal, as well as on truth information level as predicted by GEANT 4, and of LHC ATLAS data, both containing detailed information about the shower containment in cone halos of increasing sizes (see Figure 4) were processed, binning the events in terms of energy deposition for each cone size, the track momentum and pseudorapidity at which the track was measured. The resulting energy deposition density was plotted as a function of the cone radius r for different selections and observables, all of which will be explained in the following paragraphs.

The energy deposition density ρ (r) for the discrete set of radii ri is hereby defined as the sum of all energy depositions of topoclusters in the electromagnetic calorimeter, the gravitational centers of which are contained within a cone of radius ri , minus the sum of all energy depositions that are already contained in a cone of radius ri−1 , divided by the base area of the halo cone, i.e. ρ (ri ) =

E ri − E ri−1 . Ai − Ai−1

(5)

These (differential) energy deposition densities are plotted for different data sets. The

5 IMPROVING THE BACKGROUND SUBTRACTION

19

data set displayed with black markers and referred to as “DATA” contains real collision events, whereas the green data set referred to as “MC Reconstructed” contains samples of PYTHIA Monte Carlo on reconstructed information level. There are also several data sets of samples of PYTHIA Monte Carlo on GEANT 4 hits truth information level, which are split up into the different contributions. The actual background of neutral particles we want to measure (and estimate) is depicted in light/dark red and referred to as “MC Truth EM cont.” in the plots, denoting that the energy density contributing to this data set is originating from all particles interacting in the electromagnetic calorimeter except for the charged hadron track itself. The other contribution, namely “MC Truth MIP”, is depicted in blue and denotes the deposition of the charged hadron (or, in this terminology, “MIP”) itself. Some data sets are depicted in two slightly different colors, depending on whether the MIP selection was applied (light colors) or whether the sample was generated from all available events without applying the MIP selection (dark colors).

0.4

0.3

0.25 0.225 0.2 0.175 0.15 0.125 0.1 0.075 0.05

track

Figure 4: Radii of the used cones, example MIP track energy deposition in blue.

20

5.2

5 IMPROVING THE BACKGROUND SUBTRACTION

Discussion of the central detector region

A sample pair of plots for the lowest momentum bin 1.5 GeV < p < 1.8 GeV in the central detector region can be seen in Figures 5 and 6. The full set of plots can be viewed in appendix C.1. Here, however, a couple of notable features are visible. First of all the agreement between the forward and backward aligned pseudorapidity bin can be noted. The two distributions are consistent one with the other within statistical fluctuations. The MIP selected reconstructed Monte Carlo sample (green), however, does not show full agreement with the data. In fact, the deposition for the simulated data seems to exceed the measured deposition slightly. This disagreement is a consequence of a non perfect phenomenological description of the soft QCD interactions in the Monte Carlo. The general shape of the distribution is, however, very similar for data and Monte Carlo in all momentum and pseudorapidity bins. Note also that the sum of the MIP track contribution itself (blue) is sharply decreasing outside r ≈ 0.1. This provides a justification of the choice of the background estimation region as the region outside a cone with r = 0.1. This plot also shows that the contribution from particles not associated with the primary track is a flat function of r. Thus, the approximation explained in Section 4.5 (2) and [3] seems to be justified, at least for low track momenta. Furthermore, the background contribution in MIP selected tracks (light red) and in tracks without the MIP track requirement (dark red) is in fact quite similar, justifying the approach described in Section 4.5 and [3] that the background is independent of details of the hadronic showering process. One might note, however, that there is not only an offset between the reconstructed Monte Carlo data and the experimental data, but also between the Monte Carlo data on reconstructed and on truth level, i.e. that the sum of the MIP track contribution (blue) and the background contribution (light red) for MIP selected events is not always equal to the reconstructed curve (green). This effect is an artifact of the topoclustering algorithm. A further investigation of this offset is ongoing, but exceeds the scope of this work. Comparing these results to the corresponding plots in a higher momentum bin (see Figures 7 and 8), one might draw quite similar conclusions. Again, a sharp decrease of the MIP deposition curve for r > 0.1 is visible, and again one finds the Monte Carlo data at a significantly higher energy deposition than the experimental data. Note, however, a few major differences. At first, a hard drop-off of the Monte Carlo truth level background for MIP selected events (light red) can be seen with respect to the corresponding curve for tracks without the selection requirement. This is an artifact of the bias introduced

ρ/GeV

5 IMPROVING THE BACKGROUND SUBTRACTION

21

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (699 MIP sel. tracks) MC Truth EM cont. (699 MIP sel. tracks) MC Truth MIP track cont. (699 MIP sel. tracks) MC Truth EM cont. (7661 tracks, no MIP sel.) DATA (40556 MIP sel. tracks)

1.5 GeV < p < 1.8 GeV

3.5

0.0 < η < 0.6

3 2.5 2 1.5 1 0.5 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ρ/GeV

Figure 5: Differential energy deposition for 1.5 GeV < p < 1.8 GeV & 0 < η < 0.6.

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (721 MIP sel. tracks) MC Truth EM cont. (721 MIP sel. tracks) MC Truth MIP track cont. (721 MIP sel. tracks) MC Truth EM cont. (7698 tracks, no MIP sel.) DATA (41385 MIP sel. tracks)

1.5 GeV < p < 1.8 GeV

3.5

-0.6 < η < 0.0

3 2.5 2 1.5 1 0.5 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

Figure 6: Differential energy deposition for 1.5 GeV < p < 1.8 GeV & −0.6 < η < 0.

ρ/GeV

22

5 IMPROVING THE BACKGROUND SUBTRACTION

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (4551 MIP sel. tracks) MC Truth EM cont. (4551 MIP sel. tracks) MC Truth MIP track cont. (4551 MIP sel. tracks) MC Truth EM cont. (23892 tracks, no MIP sel.) DATA (4594 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

3.5

0.0 < η < 0.6

3 2.5 2 1.5 1 0.5 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ρ/GeV

Figure 7: Differential energy deposition for 4.6 GeV < p < 6.0 GeV & 0 < η < 0.6.

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (4786 MIP sel. tracks) MC Truth EM cont. (4786 MIP sel. tracks) MC Truth MIP track cont. (4786 MIP sel. tracks) MC Truth EM cont. (23561 tracks, no MIP sel.) DATA (4572 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

3.5

-0.6 < η < 0.0

3 2.5 2 1.5 1 0.5 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

Figure 8: Differential energy deposition for 4.6 GeV < p < 6.0 GeV & −0.6 < η < 0.

5 IMPROVING THE BACKGROUND SUBTRACTION

23

by imposing the MIP track requirement and therefore has no physical meaning. The requirement of a low deposition in the central cone for the reconstructed information naturally gives preference to events with an underfluctuation of the background inside this cone. The most notable feature of this plot is probably the increase of the true background energy deposition density for tracks without the MIP track requirement (dark red) close to the cone center with respect to the flat distribution for a comparably low momentum (compare to Figures 5 and 6). The slow increase of the slope of the energy density deposition as a function of the track momentum can be viewed in more detail in appendix C.1. This, however, gives rise to the conclusion that the estimation of a flat background does not hold any longer for higher track momenta.

5.3

Discussion of the forward and backward detector regions

Comparable results can be obtained – although not with the same amount of clarity – for the more forward (or backward) detector regions (see Figures 11 and 12), corresponding to higher values of pseudorapidity. Note that the momentum bins chosen here differ from the ones chosen above. Although this might be irritating at first sight, a choice of the same momentum bin would not be of greater physical meaning, since a similar absolute momentum does not imply a similar transverse momentum for different regions of pseudorapidity. This manifests in the fact that, of course, pT ≤ p. Therefore, some plots in appendix C.1 – especially those for low momenta and high values of pseudorapidity – will be found missing due to lack of statistics in these bins.

ρ/GeV

24

5 IMPROVING THE BACKGROUND SUBTRACTION

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

MC Reconstructed (199 MIP sel. tracks) MC Truth EM cont. (199 MIP sel. tracks) MC Truth MIP track cont. (199 MIP sel. tracks) MC Truth EM cont. (3840 tracks, no MIP sel.) DATA (6153 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

7

1.1 < η < 1.4

6 5 4 3 2 1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ρ/GeV

Figure 9: Differential energy deposition for 3.6 GeV < p < 4.6 GeV & 1.1 < η < 1.4

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (179 MIP sel. tracks) MC Truth EM cont. (179 MIP sel. tracks) MC Truth MIP track cont. (179 MIP sel. tracks) MC Truth EM cont. (3865 tracks, no MIP sel.) DATA (6133 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

5

-1.4 < η < -1.1

4 3 2 1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

Figure 10: Differential energy deposition for 3.6 GeV < p < 4.6 GeV & −1.4 < η < −1.1

0.4 r

ρ/GeV

5 IMPROVING THE BACKGROUND SUBTRACTION

25

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

MC Reconstructed (818 MIP sel. tracks) MC Truth EM cont. (818 MIP sel. tracks) MC Truth MIP track cont. (818 MIP sel. tracks) MC Truth EM cont. (16657 tracks, no MIP sel.) DATA (1669 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

7

1.1 < η < 1.4

6 5 4 3 2 1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ρ/GeV

Figure 11: Differential energy deposition for 6.0 GeV < p < 10.0 GeV & 1.1 < η < 1.4

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (834 MIP sel. tracks) MC Truth EM cont. (834 MIP sel. tracks) MC Truth MIP track cont. (834 MIP sel. tracks) MC Truth EM cont. (16558 tracks, no MIP sel.) DATA (1660 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

5

-1.4 < η < -1.1

4 3 2 1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

Figure 12: Differential energy deposition for 6.0 GeV < p < 10.0 GeV & −1.4 < η < −1.1

0.4 r

26

6

6 THE PARAMETRIC APPROACH

The parametric approach

In this section, we will develop, apply and investigate a method to parametrize the background from neutral particles in a linear way. First, we will derive an extrapolation method, making simple assumptions about the shape of the background energy deposition density distribution. Then, in the second part, we will apply this extrapolation method and discuss the results obtained.

6.1

Derivation

We consider the energy deposition Ei in a cone of radius ri (i = 0, . . . , n). In the following, we will consider the base area Ai = πri2 of the cone. To avoid biasing the result with the a priori unknown contribution from the track itself, we concentrate on the energy deposition in the annuli, which is given as ∆Ei = Ei − Ei−1 with i = 1, . . . n. For r ' r0 , we expect this deposition to be free from contamination from the central track energy deposition, where r0 is the typical radial dimension of the central track, which is also a priori unknown, but can be estimated to be r0 ≈ 0.1 from the plots shown in Section 5. We also need to deal with the increasing area of the annuli. Therefore, we will in the following consider the differential energy deposition density ρ, which we will define as ρ=

∂E ∂A

such that for the finite difference ∆i between the cones number (i) and (i − 1) respectively, we find ρi =

∆Ei . ∆Ai

We are interested in the correction factor Rst (p) (see also (2) in Section 4.5), which we define as the ratio between the total background energy deposition in a cone of r = t with respect to the deposition in the annulus with s < r < t, the latter being equal to the difference between the deposition in the cone of r = t and in the cone of r = s, such that E (p, r = t) E (p, r = t) − E (p, r = s)  −1 E (p, s) . = 1− E (p, t)

Rst (p) =

(6) (7)

6 THE PARAMETRIC APPROACH

27

Therefore, we seek to find an expression for the total background energy deposition E (p, r). Using the above definition of the energy deposition density ρ, we can use this quantity to express E in the form Z E= ρdA, A

suppressing the dependency of the momentum p in the notation for the sake of simplicity. We can then write Z r Z 2π r0 dr0 ρ dϕ E (r) = 0

0

which can be simplified by the assumption that the deposition density ρ = ρ (r) is independent of the angle ϕ to hold Z r ρ (r0 ) r0 dr0 . (8) E (r) = 2π 0

If we now assume that ρ (r) is a linear function of r such that ρ (r) = ar + b

(9)

we can carry out the integral to yield an expression for the total energy deposition, that is E (r) =

2πa 3 r + bπr2 . 3

(10)

Considering now that the values of a and b are obtained through a fit, the result of this calculation can be improved by choosing the fit parameters in a way such that the correlation between them is as small as possible. This can be done by parametrizing the linear function in terms of two points, which are preferredly located at the limits of the fit interval I = [r1 , r2 ] with r1 < r2 , such that the new fit parameters are ρ1 and ρ2 , the values of the energy deposition density at the fit range limits. Since we now wish to express the old fit parameters in terms of the new ones, we consider the linear function ρ (r) =

ρ2 − ρ1 · (r − r1 ) + ρ1 r2 − r1

(11)

which passes through (r1 , ρ1 ) and (r2 , ρ2 ) (and is, of course, unique). By slightly rewriting this equation to ρ (r) =

ρ2 − ρ1 ρ2 − ρ1 · r + ρ1 − · r1 r2 − r1 r2 − r1

28

6 THE PARAMETRIC APPROACH

and comparing to (9), we can easily identify ρ2 − ρ1 =a r2 − r1 ρ2 − ρ1 ρ1 − · r1 = b. r2 − r1

(12) (13)

Hence, (10) yields     2π ρ2 − ρ1 3 ρ2 − ρ1 E (r) = r + ρ1 − · r1 πr2 . 3 r2 − r1 r2 − r1

(14)

Remembering that the total energy deposition is a function of the track momentum p, i.e., E = E (p, r), we now see that the fit parameters must depend on p, such that the ρi = ρi (p) are also functions of p. Hence, the question arises whether what the resulting functional dependency of E (p, r) of the track momentum is, or – more precisely – how the functional dependency of ρi (p) propagates to E (p, r). This question can easily be answered by rewriting (14) in the form      2   2  r3 2π r3 πr r1 πr r1 2π ρ2 − ρ1 − ρ2 + ρ1 + πr2 ρ1 E (r) = 3 r2 − r1 3 r2 − r1 r2 − r1 r2 − r1       1 1 2r 2r 2 = − r1 − r1 + 1 ρ1 πr2 ρ2 πr − 3 r2 − r1 3 r2 − r1 yielding that the dependency of E is linear in both parameters ρi . Therefore, any functional dependency ρi (p) will directly translate in a linear way to the functional dependency of E (p). Physically speaking, we just calculated that if the energy deposition density shows a particular functional dependency as a function of the momentum, then the total energy deposition will show the exact same dependency, which also meets intuition. Recalling that the ρi are nothing else than the measured (or extrapolated) energy deposition densities at the fit range limits ri , the simplest assumption is that the ρi (p) are themselves linear functions of p, i.e. ρi (p) =

ρ2i − ρ1i · (p − p1 ) + ρ1i p2 − p1

(15)

where pj denotes the average track momentum corresponding to ρji . Inserting (15) for i = 1, 2 into (12) and (13) yields a (p) =

ρ21 − ρ11 − ρ22 + ρ12 ρ1 − ρ12 · (p − p1 ) + 1 (p2 − p1 ) (r2 − r1 ) (r2 − r1 )

= α1 p + α2  2  ρ1 − ρ11 ρ21 − ρ11 − ρ22 + ρ12 ρ1 − ρ12 b (p) = − · r1 · (p − p1 ) + ρ11 − 1 · r1 (p2 − p1 ) (p2 − p1 ) (r2 − r1 ) (r2 − r1 ) = β1 p + β2

6 THE PARAMETRIC APPROACH

29

which allows us to calculate E (p, r) in terms of αk and βk , such that 2π a (p) r3 + πb (p) r2 3     2π 2π 3 2 3 2 = α1 r + πβ1 r p + α2 r + πβ2 r 3 3

E (p, r) =

= pc1 (r) + c2 (r) . Recalling that the quantity we are interested in is the correction factor Rst (p), which is given by (7) and is only dependent on the value of the total background energy deposition E (p, r) at two specific values r = s, t, we can treat the crk as parameters (instead of functions) and obtain their values for r = s, t performing a fit of the form E (p; r) = pcr1 + cr2 or, equivalently, E (p; r) =

E2r − E1r (p − p1 ) + E1r p2 − p 1

to some values of E (p; r), calculated via (14) for r = s, t, making use of values for ρi previously obtained. Here, the crk (or the Ekr respectively) are fit parameters (for k = 1, 2) for both r-values of our interest (namely for r = s, t), such that we can calculate Rst (p) from (7) as a function of p via Rst

−1 E (p, s) (p) = 1 − E (p, t) −1  pcs1 + cs2 = 1− t pc1 + ct2 

or, again equivalent to that,  −1 (E2s − E1s ) (p − p1 ) + E1s (p2 − p1 ) t Rs (p) = 1 − (E2t − E1t ) (p − p1 ) + E1t (p2 − p1 )  −1 (E2s − E1s ) p + E1s p2 − E2s p1 = 1− . (E2t − E1t ) p + E1t p2 − E2t p1

(16)

30

6.2

6 THE PARAMETRIC APPROACH

Discussion

As discussed in the Section 5, a clearly visible increase of the background for the area directly around the MIP track could be observed. In proposing the parametric approach we suggested a linear approximation of the energy deposition density distribution as a function of the distance r from the charged track. This approximation was done by performing a linear fit to the measured energy deposition density in the interval [0.1, 0.26]. The fitting interval was chosen such that we are safely contained between inner region of r < 0.1 which is biased by the MIP track requirement (as discussed in Section 5) and the outer region r > 0.4 which might be biased by the track isolation requirement (see Section 4.5). The result of this approximation, again for the same pseudorapidity regions discussed in the previous sections, is shown in Figures 13, 14, 15 and 16 for the central detector regions and in Figures 19, 20, 21 and 22 for the more forward and backward detector regions. Note how the slopes of the ATLAS data and the PYTHIA Monte Carlo on reconstructed as well as on truth information level agree. All fit results can again be viewed in appendix C.2. Note also that the Monte Carlo data for the background on truth information level is represented in good approximation by the linear function for the data set without the MIP track requirement (dark red). In order to exclude that the result is biased by possibly different typical cluster sizes for clusters associated with the central track for data and Monte Carlo simulated data, the distributions for the Monte Carlo data on truth information level were plotted separately for large (large root mean square deviation (RMS) of the energy density distribution within the cluster) and small (small RMS) clusters (see Figures 17 and 18). Although there is a difference in the region close to the central track, as one would expect, these plots show that the two distributions agree within statistical fluctuations in the range used for the fitting, indicated by the vertical lines. The corresponding distributions for other momentum and pseudorapidity bins can also be found in appendix C.4. For the more forward and backward detector regions, one finds that the agreement between the slopes of data and Monte Carlo decreases. This is, however, not a problem. Even a disagreement of the slopes (as seen in Figures 21 and 22) where the parametrization predicts a flat behaviour of the background in the central cone is only equal to the old approximation method (explained in Section 4.5, [3]) which assumed the background to be a flat function regardless of track momentum and pseudorapidity.

ρ/GeV

6 THE PARAMETRIC APPROACH

31

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (699 MIP sel. tracks) MC Truth EM cont. (699 MIP sel. tracks) MC Truth MIP track cont. (699 MIP sel. tracks) MC Truth EM cont. (7661 tracks, no MIP sel.) DATA (40556 MIP sel. tracks)

1.5 GeV < p < 1.8 GeV

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Figure 13: Linear approximation to differential energy deposition for 1.5 GeV < p < 1.8 GeV & 0.0 < η < 0.6.

5 4.5

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4

tracks with p >1.5 GeV T

MC Reconstructed (721 MIP sel. tracks) MC Truth EM cont. (721 MIP sel. tracks) MC Truth MIP track cont. (721 MIP sel. tracks) MC Truth EM cont. (7698 tracks, no MIP sel.) DATA (41385 MIP sel. tracks)

1.5 GeV < p < 1.8 GeV

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Figure 14: Linear approximation to differential energy deposition for 1.5 GeV < p < 1.8 GeV & −0.6 < η < 0.

0.4 r

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32

6 THE PARAMETRIC APPROACH

5 4.5

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tracks with p >1.5 GeV T

MC Reconstructed (4551 MIP sel. tracks) MC Truth EM cont. (4551 MIP sel. tracks) MC Truth MIP track cont. (4551 MIP sel. tracks) MC Truth EM cont. (23892 tracks, no MIP sel.) DATA (4594 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

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Figure 15: Linear approximation to differential energy deposition for 4.6 GeV < p < 6.0 GeV & 0.0 < η < 0.6.

5 4.5

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tracks with p >1.5 GeV T

MC Reconstructed (4786 MIP sel. tracks) MC Truth EM cont. (4786 MIP sel. tracks) MC Truth MIP track cont. (4786 MIP sel. tracks) MC Truth EM cont. (23561 tracks, no MIP sel.) DATA (4572 MIP sel. tracks)

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Figure 16: Linear approximation to differential energy deposition for 4.6 GeV < p < 6.0 GeV & −0.6 < η < 0.

0.4 r

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6 THE PARAMETRIC APPROACH

33

3 ATLAS work in progress 2.5

MC Truth EM cont. (low RMS, 29691 tracks) MC Truth EM cont. (high RMS, 9755 tracks)

all tracks with p >1.5 GeV T

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Figure 17: Comparison of differential energy deposition for 3.6 GeV < p < 4.6 GeV & 0.0 < η < 0.6 for wide (high RMS) and narrow (low RMS) clusters.

3 ATLAS work in progress 2.5

MC Truth EM cont. (low RMS, 30016 tracks) MC Truth EM cont. (high RMS, 9451 tracks)

all tracks with p >1.5 GeV T

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Figure 18: Comparison of differential energy deposition for 3.6 GeV < p < 4.6 GeV & −0.6 < η < 0.0 for wide (high RMS) and narrow (low RMS) clusters.

ρ/GeV

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6 THE PARAMETRIC APPROACH

10 9

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8

tracks with p >1.5 GeV T

MC Reconstructed (199 MIP sel. tracks) MC Truth EM cont. (199 MIP sel. tracks) MC Truth MIP track cont. (199 MIP sel. tracks) MC Truth EM cont. (3840 tracks, no MIP sel.) DATA (6153 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

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1.1 < η < 1.4

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Figure 19: Linear approximation to differential energy deposition for 3.6 GeV < p < 4.6 GeV & 1.1 < η < 1.4.

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (179 MIP sel. tracks) MC Truth EM cont. (179 MIP sel. tracks) MC Truth MIP track cont. (179 MIP sel. tracks) MC Truth EM cont. (3865 tracks, no MIP sel.) DATA (6133 MIP sel. tracks)

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Figure 20: Linear approximation to differential energy deposition for 3.6 GeV < p < 4.6 GeV & −1.4 < η < −1.1.

0.4 r

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6 THE PARAMETRIC APPROACH

35

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

MC Reconstructed (818 MIP sel. tracks) MC Truth EM cont. (818 MIP sel. tracks) MC Truth MIP track cont. (818 MIP sel. tracks) MC Truth EM cont. (16657 tracks, no MIP sel.) DATA (1669 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

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1.1 < η < 1.4

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Figure 21: Linear approximation to differential energy deposition for 6.0 GeV < p < 10.0 GeV & 1.1 < η < 1.4.

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (834 MIP sel. tracks) MC Truth EM cont. (834 MIP sel. tracks) MC Truth MIP track cont. (834 MIP sel. tracks) MC Truth EM cont. (16558 tracks, no MIP sel.) DATA (1660 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

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Figure 22: Linear approximation to differential energy deposition for 6.0 GeV < p < 10.0 GeV & −1.4 < η < −1.1.

0.4 r

36

6 THE PARAMETRIC APPROACH

Based on the successful linear parametrization of the data set, we can now try to express the total energy deposition in a cone of any desired size as a function of the track momentum. Hence, the mean track momentum of all tracks contributing to each data set in a given bin was computed respectively, as well as the integral over the parametrization from r = 0 to the radius of the desired cone expressed as a function of this (average) track momentum. As explained in the previous section, this is also expected to behave like a linear function in the same approximation as above. This can in fact be seen to be in reasonable agreement with the data (see Figures 23, 24, 25 and 26). 0.2 From this result, we can calculate the desired correction factor R0.1 directly. Note, however, that the quantity needed for the estimation of the E/p background is actually the neutral background in a cone of r = 0.2, which is precisely the result obtained for E 0.2 (p). Thus, one could equivalently also use the result already obtained.

E/GeV

6 THE PARAMETRIC APPROACH

37

0.35

0.3

ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

0.0 < η < 0.6

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Figure 23: Total background energy deposition in a cone of r = 0.1 for 0.0 < η < 0.6 as a function of the track momentum p.

0.35

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ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

-0.6 < η < 0.0

T

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

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E/GeV

38

6 THE PARAMETRIC APPROACH

1 0.9

ATLAS work in progress

0.8

E 2 (p) for tracks with p >1.5 GeV

0.2

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0.6 0.5 0.4 0.3 0.2 0.1 0

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Figure 25: Total energy deposition in a cone of r = 0.2 for 0.0 < η < 0.6 as a function of the track momentum p.

1 0.9

ATLAS work in progress

0.8

E 2 (p) for tracks with p >1.5 GeV

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p/MeV/c Figure 26: Total background energy deposition in a cone of r = 0.2 for −0.6 < η < 0.0 as a function of track momentum p.

7 RESULTS

7

39

Results

In this section, we will briefly review the results obtained in Section 6.2 in the context of the considerations made previously (see Sections 4.4 and 4.5).

7.1

Results on E/p measurements

Making use of the results for the total background energy deposition E r (p) in cones of r = 0.1 and r = 0.2 as functions of the track momentum p for all pseudorapidity bins respectively obtained in Section 6.2, we can use equation 16 as derived in Section 6.1 to calculate a momentum-based correction factor for the background subtracted in the context of E/p measurements (see Sections 4.4 and 4.5). √ A new analysis of the considered 2010 data at s = 7 TeV was performed, using the 0.2 momentum-based correction factor R0.1 (p) as defined in Section 6.1 (see equation 6) and the fit results obtained and discussed in Section 6.2. The resulting E/p distributions can be found in appendix C.7 and compared with the corresponding results for the previously used correction factor of R = 4/3, found in appendix C.6. The difference is, however, small. As can be seen in Figures 27 and 28, the old background estimation method yields a backgorund estimate which is of the order of 10% lower than the new background estimation method. This might be surprising at first sight when comparing to the plots in Section 6.2, which clearly show that the background energy density deposition as a function of the distance from the charged track is not constant, especially close to the track itself. But, since the difference occurs mainly in the cone centers, and since the total area in which the background contribution is significantly higher than estimated previously is comparably small, the total error arising from the “flat” background estimation is also small. This shows that, although the discussion in Section 6.2 came to the conclusion that the assumption of a “flat” background in the innermost cone is not completely justified, the formerly applied procedure based on this assumption does not suffer from a large systematic error. As a matter of optimization, however, the improved, parametric and momentum-based correction method proposed in this thesis should be used for future measurements.

40

7 RESULTS

0.1

ATLAS work in progress

bg

0.08

0.06

0.04 0.0 < η < 0.6 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02

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0.1

ATLAS work in progress

bg

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0.04 -0.6 < η < 0.0 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

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7 RESULTS

7.2

41

Conclusions

The background estimation method for E/p measurements of the single hadron response of the ATLAS calorimeter system was reviewed. The results obtained in Section 5 clearly show that the assumption of a “flat” background distribution does not hold in the region close to the track, especially for high track momenta. The solution proposed in Section 6.1 was a parametric approach, trying to parametrize the differential energy deposition as a function of distance from the charged track with a linear function. The results obtained from this calculation have led to a new method to estimate the background correction factor based on the track momentum, see Section 6.2. The impact of this new correction method on the E/p measurements is, however, small. Although the difference between the estimated “flat” background and the actual background energy deposition is large close to the track, the resulting integrated total energy deposition does not differ by much because of the decreasing weight given to the energy deposition density for small radii. The underestimate of the background resulting from the previously made assumption does barely exceed 10%, leading to the comforting conclusion that the results obtained by previous measurements are already accurate to a high degree, although the accuracy could be pushed further making use of the results obtained in this thesis.

7.3

Outlook

Although the corrections calculated on top of the background estimate were already small, a precise investigation of some of the plots shown in the appendix C.2 demonstrates that the assumption of a linear dependency of the energy deposition density as a function of distance from the track is also not completely justified in some cases. However, any assumption of a parametric model without clear physical motivation will impose a bias. While the assumption of simple models can often be motivated by their simplicity, more complex models always impose the danger of overfitting, especially if the number of data points accessible is low. One way of overcoming this danger is the consideration of larger sets of data, which is expensive, though. Another possibility would be the use of nonparametric models, such as bayesian modelling techniques. Approaches to estimate the background with such models, using approved non-parametric algorithms such as krieging (see, e.g., [16]) have been made, but did not yet lead to significantly improved results compared to the simple parametric model proposed here. A further investigation of these models would, however, be interesting.

42

PAGE 42

REFERENCES

v

References [1] ATLAS Collaboration. Jet energy scale and its systematic uncertainty for jets pro√ duced in proton-proton collisions at s = 7 TeV and measured with the ATLAS detector. ATLAS-CONF, 2010-056:23, July 22 2010. 13, 14 [2] ATLAS Collaboration. Response of the ATLAS calorimeters to single isolated had√ rons produced in proton–proton collisions at a center–of–mass energy of s = 900 GeV. ATLAS-CONF, 2010-017:11, April 8 2010. 14, 15 [3] ATLAS Collaboration. ATLAS calorimeter response to single isolated hadrons and estimation of the calorimeter jet scale uncertainty. ATLAS-CONF, 2010-052:23, July 16 2010. 14, 15, 16, 20, 30 [4] ATLAS Collaboration. ATLAS calorimeter response to single isolated hadrons and estimation of the calorimeter jet scale uncertainty. ATLAS-CONF, 2011-028:16, March 22 2011. 14 [5] Torbjörn Sjöstrand, Stephen Mrennab, and Peter Skandsc. PYTHIA 6.4 physics and manual. Journal of High Energy Physics, 026:583, 2006. 15, 45 [6] ATLAS Collaboration. Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC. CERN-PH-EP, 2010-079:70, February 9 2011. 45 [7] S. Agostinelli et al. Geant4 – a simulation toolkit. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 506:issue 3, 250–303, 2003. 15, 45 [8] Lyndon Evans and Philip Bryant. The LHC machine. Journal of Instrumentation, The CERN Large Hadron Collider: Accelerator and Experiments:164, August 2008. http://jinst.sissa.it/LHC/LHCmachine/2008_JINST_3_S08001.pdf. 5 [9] ALICE Collaboration. The ALICE experiment at the CERN LHC. Journal of Instrumentation, The CERN Large Hadron Collider: Accelerator and Experiments:259, August 2008. http://jinst.sissa.it/LHC/ALICE/2008_JINST_3_S08002.pdf. 5 [10] LHCb Collaboration. The LHCb detector at the LHC. Journal of Instrumentation, The CERN Large Hadron Collider: Accelerator and Experiments:217, August 2008. http://jinst.sissa.it/LHC/LHCb/2008_JINST_3_S08005.pdf. 6 [11] CMS Collaboration. The CMS experiment at the CERN LHC. Journal of Instrumentation, The CERN Large Hadron Collider: Accelerator and Experiments:361, August 2008. http://jinst.sissa.it/LHC/CMS/2008_JINST_3_S08004.pdf. 7

vi

REFERENCES

[12] ATLAS Collaboration. The ATLAS experiment at the CERN LHC. Journal of Instrumentation, The CERN Large Hadron Collider: Accelerator and Experiments:437, August 2008. http://jinst.sissa.it/LHC/ATLAS/2008_JINST_3_S08003.pdf. 7, 8, 12, vii [13] Richard Wigmans. Calorimetry – Energy Measurement in Particle Physics. Number 107 in International Series of Monographs on Physics. Oxford University Press, Texas Tech University, 2000. ISBN 978-0-198-50296-6. 9, 11 [14] David Griffiths. Introduction to Elementary Particles. Wiley-VCH, 2004. ISBN 978-0-471-60386-3. 6, 9, 43 [15] Francis Halzen and Alan D. Martin. Quarks and Leptons – An Introductory Course in Modern Particle Physics. John Wiley & Sons, 1984. ISBN 978-0-471-88741-2. 6, 9, 43 [16] Carl Edward Rasmussen and Christopher K. I. Williams. Gaussian Processes for Machine Learning. The MIT Press, 2006. ISBN 978-0-262-18253-X, http://www. GaussianProcess.org/gpml. 41

LIST OF FIGURES

vii

List of Figures 1

CERN overview and LHC tunnel . . . . .

4

The ATLAS Detector. Reproduced from [12] with kind permission from IOP Publishing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

http://lhcb.web.cern.ch/lhcb-public/Objects/Detector/CERNMap.pdf

2 3

The ATLAS Calorimeter system. Reproduced from [12] with kind permission from IOP Publishing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4

Cone Radii and example MIP track energy deposition . . . . . . . . . . . . 19

5

Differential energy deposition for 1.5 GeV < p < 1.8 GeV & 0 < η < 0.6.

6

Differential energy deposition for 1.5 GeV < p < 1.8 GeV & −0.6 < η < 0.

7

Differential energy deposition for 4.6 GeV < p < 6.0 GeV & 0 < η < 0.6.

8

Differential energy deposition for 4.6 GeV < p < 6.0 GeV & −0.6 < η < 0.

9

Differential energy deposition for 3.6 GeV < p < 4.6 GeV & 1.1 < η < 1.4 . 24

10

Differential energy deposition for 3.6 GeV < p < 4.6 GeV & −1.4 < η < −1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

11

Differential energy deposition for 6.0 GeV < p < 10.0 GeV & 1.1 < η < 1.4

12

Differential energy deposition for 6.0 GeV < p < 10.0 GeV & −1.4 < η < −1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

13

Linear approximation to differential energy deposition for 1.5 GeV < p < 1.8 GeV & 0.0 < η < 0.6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

14

Linear approximation to differential energy deposition for 1.5 GeV < p < 1.8 GeV & −0.6 < η < 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

15

Linear approximation to differential energy deposition for 4.6 GeV < p < 6.0 GeV & 0.0 < η < 0.6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

16

Linear approximation to differential energy deposition for 4.6 GeV < p < 6.0 GeV & −0.6 < η < 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

17

Comparison of differential energy deposition for 3.6 GeV < p < 4.6 GeV & 0.0 < η < 0.6 for wide (high RMS) and narrow (low RMS) clusters. . 33

18

Comparison of differential energy deposition for 3.6 GeV < p < 4.6 GeV & −0.6 < η < 0.0 for wide (high RMS) and narrow (low RMS) clusters.

19

. 21 21 . 22 22

25

33

Linear approximation to differential energy deposition for 3.6 GeV < p < 4.6 GeV & 1.1 < η < 1.4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

viii

LIST OF FIGURES

20

Linear approximation to differential energy deposition for 3.6 GeV < p < 4.6 GeV & −1.4 < η < −1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

21

Linear approximation to differential energy deposition for 6.0 GeV < p < 10.0 GeV & 1.1 < η < 1.4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

22

Linear approximation to differential energy deposition for 6.0 GeV < p < 10.0 GeV & −1.4 < η < −1.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

23

Total background energy deposition in a cone of r = 0.1 for 0.0 < η < 0.6 as a function of the track momentum p. . . . . . . . . . . . . . . . . . . . . 37

24

Total energy deposition in a cone of r = 0.1 for −0.6 < η < 0.0 as a function of the track momentum p. . . . . . . . . . . . . . . . . . . . . . . 37

25

Total energy deposition in a cone of r = 0.2 for 0.0 < η < 0.6 as a function of the track momentum p. . . . . . . . . . . . . . . . . . . . . . . 38

26

Total background energy deposition in a cone of r = 0.2 for −0.6 < η < 0.0 as a function of track momentum p. . . . . . . . . . . . . . . . . . . . . . . 38

27

E/p background distributions for 0.0 < η < 0.6 for the different correction factors respectively. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

28

E/p background distributions for −0.6 < η < 0.0 for the different correction factors respectively. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

29

Plot of η vs. polar angle θ http://upload.wikimedia.org/wikipedia/commons/3/30/Pseudorapidity2.png

. . 44

ACKNOWLEDGEMENTS

ix

Acknowledgements First of all, I want to thank my advisor Dr. Iacopo Vivarelli for his continuous support, including constructive and always polite criticism regarding my results and the way I present them, and nearly infinite amounts of time for answering questions and making suggestions. I especially want to thank him for the possibility to join him on a visit to CERN, a truly inspiring opportunity. Thanks for numerous suggestions and constructive criticism also go to Dr. Michael Duehrssen. I also want to thank Prof. Dr. Karl Jakobs for the opportunity to write my thesis in his group, and to participate in a such a fascinating project as the ATLAS collaboration. I also want to thank the other members of his group for welcoming me during the three months I spent writing my thesis. Special thanks go to Dr. Cyrill Stachniss and Axel Rottman for a short introduction to krieging, although the work related to this did not make it to the final version of this thesis. Great thanks go to my parents for their continuous support, and favours beyond thinking. Special thanks also go to Freya for understanding I had little time for the sunny sides of life while working on my thesis. The latter, of course, also extends to many of my other friends, to whom I want to apologize for this and whom I also want to thank for their understanding.

Carsten Burgard

x

ACKNOWLEDGEMENTS

A THE ATLAS COORDINATE SYSTEM

A

43

The ATLAS coordinate system

The coordinate system of ATLAS is a right-handed one, with the x axis pointing in radial direction towards the center of circle which the LHC tunnel describes, and the z-axis pointing along a tangent to the LHC tunnel tube center. The y-axis however is slightly tilted with respect to the vertical due to the general tilt of the tunnel, amounting to a total deviation from the vertical of approximately 1.5◦ . The usual coordinates are rT , η and φ, where rT is the distance from the beam axis itself (which is equal to the z-axis) and φ is the angle of the track in the transversal plain. The coordinate η denotes the pseudorapidity, usually defined as θ 2 where θ denotes the polar angle with respect to the beam (or z-) axis. This choice of η as a suitable coordinate can easily be explained, considering that the LHC is a protonproton collider. In the central interaction vertex, two partons collide, each carrying a fraction x of the total momentum of the proton (which is sometimes denoted as xBj and referred to as Bjorken- or Feynman-x [14, 15]). The precise value of x is of course different for both partners in every single interaction, and more or less random, following a certain distribution given by the parton density functions, which in turn depend on the momentum transfer of the interaction. The relative velocity of the center-of-mass frame of the collision along the beam axis with respect to the detector is therefore a priori not known. η = − ln tan

Consequently, one wants to choose a coordinate system which is invariant under Lorentz-transformations in the direction of the beam axis. This gives rise to the quantity η as defined above. Although η is not Lorentz-invariant (strictly speaking), the use of η (instead of the polar angle θ against the beam axis) has some advantages. The pseudorapidity η is (as the name might suggest) very closely related to the rapidity y. This can be shown very easily. p  z y = arc tanh E     1 + pEz E + pz 1 def. 1 = ln = ln 2 1 − pEz 2 E − pz s r   Emc2 1 |~p| + pL |~p| − pL 1 − cos θ ≈ ln = − ln = − ln 2 |~p| − pL |~p| + pL 1 + cos θ def.

= − ln tan

=η

θ 2

44

A THE ATLAS COORDINATE SYSTEM

The rapidity y is indeed not Lorentz invariant either, but differences in rapidity are. Thus, any quantity ∆y will be Lorentz invariant – and therefore also differences in pseudorapidity in an approximate manner. Since the pseudorapidity η can directly be calculated from the polar angle θ, the consequent use of η as a coordinate with respect to the beam axis provides many practical advantages. The value η = 0 here corresponds to the transversal plain in the central region of the detector, i.e. θ = π/2, whereas points along the beam axis correspond to infinite values of pseudorapidity. Although this might seem like a disadvantage, pseudorapidity values one has to deal with usually do not exceed η ≈ 5 due to the limited forward and backward region coverage of the detector. Some examples for value pairs of η and θ are visualized in figure 29.

Figure 29: Plot of η vs. polar angle θ

Since every track in an event is expressed in values of η and φ, all geometric quantities are defined based on these coordinates. Of particular importance for us is the distance ∆R between two tracks, which is defined as q ∆R = (∆η)2 + (∆φ)2 which is in an idealized view independent of the distance rT from the beam axis at which it is measured. This is of course not true when taking into account changes in direction resulting from interaction with the detector material or with the magnetic field of the inner detector silicon tracker.

B MONTE CARLO SIMULATION

B

45

Monte Carlo Simulation

The Monte Carlo samples used for this work correspond to a set of approximately 50 million non diffractive minimum bias events. Approximately half of the simulated events have a filter selecting a 3.5 GeV leading charged particle at generator level, in order to increase the available number of events for high track momenta. PYTHIA 6.4 [5] has been used for the generation of the events. The PYTHIA tuning corresponds to AMBT1 (ATLAS Minimum Bias Tune 1) [6]. The detector response has been simulated using GEANT 4 [7], with the Calibration Hits and ParticleID features enabled. The former keeps track of the energy deposited at GEANT 4 hit level and classifies into different categories depending on whether the energy is visible or invisible for measurement purposes. The latter keeps track of the association of each hit to the particle that generated it, therefore allowing (for the purposes of this work) for association of the true energy deposit to the neutral background or the signal. The MC simulated events have been reconstructed and analyzed using the same software used for real data.

46

C COLLECTION OF ALL PLOTS

C

Collection of all plots Energy deposition density ATLAS work in progress

4

tracks with p >1.5 GeV T

5 4.5 4

0.0 < η < 0.6

3

2.5

2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

0

0.4 r

MC Reconstructed (1463 MIP sel. tracks) MC Truth EM cont. (1463 MIP sel. tracks) MC Truth MIP track cont. (1463 MIP sel. tracks) MC Truth EM cont. (13759 tracks, no MIP sel.) DATA (54049 MIP sel. tracks)

ρ/GeV

0.05

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (1400 MIP sel. tracks) MC Truth EM cont. (1400 MIP sel. tracks) MC Truth MIP track cont. (1400 MIP sel. tracks) MC Truth EM cont. (11348 tracks, no MIP sel.) DATA (44375 MIP sel. tracks)

2.2 GeV < p < 2.8 GeV

3.5

0

0.4 r

5 4.5

2.5

2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.15

0.2

0.1

0.25

0.3

0.35

0.4 r

0.15

0.2

ATLAS work in progress tracks with p >1.5 GeV

0.25

0.3

0.35

0.4 r

T

MC Reconstructed (1506 MIP sel. tracks) MC Truth EM cont. (1506 MIP sel. tracks) MC Truth MIP track cont. (1506 MIP sel. tracks) MC Truth EM cont. (13661 tracks, no MIP sel.) DATA (55414 MIP sel. tracks)

1.8 GeV < p < 2.2 GeV -0.6 < η < 0.0

0.05

0.1

0.15

0.2

ATLAS work in progress

4 3

0.1

0.05

tracks with p >1.5 GeV

0.25

0.3

0.35

0.4 r

T

0

MC Reconstructed (1471 MIP sel. tracks) MC Truth EM cont. (1471 MIP sel. tracks) MC Truth MIP track cont. (1471 MIP sel. tracks) MC Truth EM cont. (11583 tracks, no MIP sel.) DATA (45729 MIP sel. tracks)

2.2 GeV < p < 2.8 GeV

3.5

0.0 < η < 0.6

0.05

-0.6 < η < 0.0

5 4.5

3

0

1.5 GeV < p < 1.8 GeV

3.5

0.0 < η < 0.6

0.05

T

MC Reconstructed (721 MIP sel. tracks) MC Truth EM cont. (721 MIP sel. tracks) MC Truth MIP track cont. (721 MIP sel. tracks) MC Truth EM cont. (7698 tracks, no MIP sel.) DATA (41385 MIP sel. tracks)

5 4.5

2.5

0

tracks with p >1.5 GeV

4

1.8 GeV < p < 2.2 GeV

3.5

ATLAS work in progress

3.5

3

0

ρ/GeV

MC Reconstructed (699 MIP sel. tracks) MC Truth EM cont. (699 MIP sel. tracks) MC Truth MIP track cont. (699 MIP sel. tracks) MC Truth EM cont. (7661 tracks, no MIP sel.) DATA (40556 MIP sel. tracks)

1.5 GeV < p < 1.8 GeV

3.5

ρ/GeV

ρ/GeV

5 4.5

ρ/GeV

ρ/GeV

C.1

-0.6 < η < 0.0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ATLAS work in progress

4

tracks with p >1.5 GeV T

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

0

0.4 r

MC Reconstructed (8529 MIP sel. tracks) MC Truth EM cont. (8529 MIP sel. tracks) MC Truth MIP track cont. (8529 MIP sel. tracks) MC Truth EM cont. (46934 tracks, no MIP sel.) DATA (11253 MIP sel. tracks)

ρ/GeV

0.1

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

4

tracks with p >1.5 GeV T

0

0.4 r

5 4.5

MC Reconstructed (4551 MIP sel. tracks) MC Truth EM cont. (4551 MIP sel. tracks) MC Truth MIP track cont. (4551 MIP sel. tracks) MC Truth EM cont. (23892 tracks, no MIP sel.) DATA (4594 MIP sel. tracks)

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (1825 MIP sel. tracks) MC Truth EM cont. (1825 MIP sel. tracks) MC Truth MIP track cont. (1825 MIP sel. tracks) MC Truth EM cont. (9628 tracks, no MIP sel.) DATA (1660 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

5

0

0.4 r

tracks with p >1.5 GeV

0.25

0.3

0.35

0.4 r

T

MC Reconstructed (8794 MIP sel. tracks) MC Truth EM cont. (8794 MIP sel. tracks) MC Truth MIP track cont. (8794 MIP sel. tracks) MC Truth EM cont. (47000 tracks, no MIP sel.) DATA (11771 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV -0.6 < η < 0.0

0.05

0.1

0.15

0.2

ATLAS work in progress tracks with p >1.5 GeV

0.25

0.3

0.35

0.4 r

T

MC Reconstructed (4786 MIP sel. tracks) MC Truth EM cont. (4786 MIP sel. tracks) MC Truth MIP track cont. (4786 MIP sel. tracks) MC Truth EM cont. (23561 tracks, no MIP sel.) DATA (4572 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV -0.6 < η < 0.0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (2020 MIP sel. tracks) MC Truth EM cont. (2020 MIP sel. tracks) MC Truth MIP track cont. (2020 MIP sel. tracks) MC Truth EM cont. (9532 tracks, no MIP sel.) DATA (1751 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

3.5

0.0 < η < 0.6

0.2

ATLAS work in progress

3.5

0.0 < η < 0.6

0.15

5 4.5

2.5

0

0.1

4

4.6 GeV < p < 6.0 GeV

3.5

0.05

3.5

0.0 < η < 0.6

0.05

2.8 GeV < p < 3.6 GeV

5 4.5

2.5

0

T

MC Reconstructed (1419 MIP sel. tracks) MC Truth EM cont. (1419 MIP sel. tracks) MC Truth MIP track cont. (1419 MIP sel. tracks) MC Truth EM cont. (8454 tracks, no MIP sel.) DATA (26066 MIP sel. tracks)

-0.6 < η < 0.0

4

3.6 GeV < p < 4.6 GeV

3.5

tracks with p >1.5 GeV

3.5

0.0 < η < 0.6

0.05

ATLAS work in progress

4

2.8 GeV < p < 3.6 GeV

ρ/GeV

ρ/GeV

5 4.5

2.5

0

ρ/GeV

MC Reconstructed (1293 MIP sel. tracks) MC Truth EM cont. (1293 MIP sel. tracks) MC Truth MIP track cont. (1293 MIP sel. tracks) MC Truth EM cont. (8416 tracks, no MIP sel.) DATA (25643 MIP sel. tracks)

ρ/GeV

5 4.5 3.5

ρ/GeV

47

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS

-0.6 < η < 0.0

3

4

2.5 3

2 1.5

2

1 1 0

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 18

ATLAS work in progress

16

tracks with p >1.5 GeV T

MC Reconstructed (159 MIP sel. tracks) MC Truth EM cont. (159 MIP sel. tracks) MC Truth MIP track cont. (159 MIP sel. tracks) MC Truth EM cont. (891 tracks, no MIP sel.) DATA (106 MIP sel. tracks)

10.0 GeV < p

14

0.0 < η < 0.6

20 18

tracks with p >1.5 GeV

14

-0.6 < η < 0.0

12

10

10

8

8

6

6

4

4

2

2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

0

0.4 r

MC Reconstructed (313 MIP sel. tracks) MC Truth EM cont. (313 MIP sel. tracks) MC Truth MIP track cont. (313 MIP sel. tracks) MC Truth EM cont. (4487 tracks, no MIP sel.) DATA (12049 MIP sel. tracks)

T

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

5 4.5

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (320 MIP sel. tracks) MC Truth EM cont. (320 MIP sel. tracks) MC Truth MIP track cont. (320 MIP sel. tracks) MC Truth EM cont. (4511 tracks, no MIP sel.) DATA (12354 MIP sel. tracks)

1.8 GeV < p < 2.2 GeV

3.5

0.6 < η < 1.1

MC Reconstructed (133 MIP sel. tracks) MC Truth EM cont. (133 MIP sel. tracks) MC Truth MIP track cont. (133 MIP sel. tracks) MC Truth EM cont. (863 tracks, no MIP sel.) DATA (109 MIP sel. tracks)

10.0 GeV < p

4

1.8 GeV < p < 2.2 GeV

5

ATLAS work in progress

16

12

0

ρ/GeV

ρ/GeV

20

ρ/GeV

ρ/GeV

48

-1.1 < η < -0.6

3

4

2.5 3

2 1.5

2

1 1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

0

0.4 r

ρ/GeV

ρ/GeV

0

0.5

MC Reconstructed (693 MIP sel. tracks) MC Truth EM cont. (693 MIP sel. tracks) MC Truth MIP track cont. (693 MIP sel. tracks) MC Truth EM cont. (10430 tracks, no MIP sel.) DATA (22389 MIP sel. tracks)

0.1

0.15

0.2

6

ATLAS work in progress T

3

0.3

0.35

0.4 r

MC Reconstructed (695 MIP sel. tracks) MC Truth EM cont. (695 MIP sel. tracks) MC Truth MIP track cont. (695 MIP sel. tracks) MC Truth EM cont. (10180 tracks, no MIP sel.) DATA (23114 MIP sel. tracks)

2.2 GeV < p < 2.8 GeV

5

0.6 < η < 1.1

0.25

7

tracks with p >1.5 GeV

2.2 GeV < p < 2.8 GeV

3.5

0.05

-1.1 < η < -0.6

4

2.5 3

2 1.5

2

1 1

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (500 MIP sel. tracks) MC Truth EM cont. (500 MIP sel. tracks) MC Truth MIP track cont. (500 MIP sel. tracks) MC Truth EM cont. (6749 tracks, no MIP sel.) DATA (15672 MIP sel. tracks)

6

3

3

2

2

1

1 0.15

0.2

0.25

0.3

0.35

0.2

T

4

0.1

0.15

ATLAS work in progress

0.4 r

0.25

0.3

0.35

0.4 r

0

MC Reconstructed (549 MIP sel. tracks) MC Truth EM cont. (549 MIP sel. tracks) MC Truth MIP track cont. (549 MIP sel. tracks) MC Truth EM cont. (6921 tracks, no MIP sel.) DATA (16085 MIP sel. tracks)

2.8 GeV < p < 3.6 GeV

5

0.6 < η < 1.1

0.05

0.1

7

4

0

0.05

tracks with p >1.5 GeV

2.8 GeV < p < 3.6 GeV

5

0

0.4 r

ρ/GeV

ρ/GeV

0

-1.1 < η < -0.6

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

49

7 6

ATLAS work in progress tracks with p >1.5 GeV T

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Reconstructed (746 MIP sel. tracks) MC Truth EM cont. (746 MIP sel. tracks) MC Truth MIP track cont. (746 MIP sel. tracks) MC Truth EM cont. (6597 tracks, no MIP sel.) DATA (7950 MIP sel. tracks)

ATLAS work in progress

4

3.6 GeV < p < 4.6 GeV

5

5 4.5

tracks with p >1.5 GeV T

3.6 GeV < p < 4.6 GeV

3.5

0.6 < η < 1.1

MC Reconstructed (760 MIP sel. tracks) MC Truth EM cont. (760 MIP sel. tracks) MC Truth MIP track cont. (760 MIP sel. tracks) MC Truth EM cont. (6652 tracks, no MIP sel.) DATA (8251 MIP sel. tracks)

-1.1 < η < -0.6

3

4

2.5 3

2 1.5

2

1 1

0.5 0.1

0.15

0.2

6

ATLAS work in progress

0.35

T

0

0.4 r

MC Reconstructed (2501 MIP sel. tracks) MC Truth EM cont. (2501 MIP sel. tracks) MC Truth MIP track cont. (2501 MIP sel. tracks) MC Truth EM cont. (21425 tracks, no MIP sel.) DATA (3606 MIP sel. tracks)

6

3

3

2

2

1

1 0.2

0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

0

0.4 r

MC Reconstructed (1629 MIP sel. tracks) MC Truth EM cont. (1629 MIP sel. tracks) MC Truth MIP track cont. (1629 MIP sel. tracks) MC Truth EM cont. (16152 tracks, no MIP sel.) DATA (1452 MIP sel. tracks)

ρ/GeV

0.15

6

3

3

2

2

1

1 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

8

tracks with p >1.5 GeV

7

0.6 < η < 1.1

T

0

0.4 r

10 9

0.05

0.1

MC Reconstructed (122 MIP sel. tracks) MC Truth EM cont. (122 MIP sel. tracks) MC Truth MIP track cont. (122 MIP sel. tracks) MC Truth EM cont. (1759 tracks, no MIP sel.) DATA (99 MIP sel. tracks)

0.15

0.2

ATLAS work in progress T

4

0.05

0.35

0.4 r

MC Reconstructed (2676 MIP sel. tracks) MC Truth EM cont. (2676 MIP sel. tracks) MC Truth MIP track cont. (2676 MIP sel. tracks) MC Truth EM cont. (21439 tracks, no MIP sel.) DATA (3691 MIP sel. tracks)

0.25

0.3

0.35

0.4 r

7

4

0

0.3

4.6 GeV < p < 6.0 GeV

14

MC Reconstructed (1732 MIP sel. tracks) MC Truth EM cont. (1732 MIP sel. tracks) MC Truth MIP track cont. (1732 MIP sel. tracks) MC Truth EM cont. (16093 tracks, no MIP sel.) DATA (1499 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

5

0.6 < η < 1.1

0.25

-1.1 < η < -0.6

tracks with p >1.5 GeV

6.0 GeV < p < 10.0 GeV

5

0.2

T

4

0.1

0.15

ATLAS work in progress

5

0.6 < η < 1.1

0.05

0.1

7

4

0

0.05

tracks with p >1.5 GeV

4.6 GeV < p < 6.0 GeV

5

ρ/GeV

0.3

7

tracks with p >1.5 GeV

ρ/GeV

0.25

ρ/GeV

0.05

ρ/GeV

ρ/GeV

0

-1.1 < η < -0.6

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.1 < η < -0.6

T

10.0 GeV < p

0.25

0.3

0.35

0.4 r

MC Reconstructed (115 MIP sel. tracks) MC Truth EM cont. (115 MIP sel. tracks) MC Truth MIP track cont. (115 MIP sel. tracks) MC Truth EM cont. (1727 tracks, no MIP sel.) DATA (130 MIP sel. tracks)

10.0 GeV < p

6 8

5

6

4 3

4

2 2

1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 10 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

ρ/GeV

ρ/GeV

50 MC Reconstructed (33 MIP sel. tracks) MC Truth EM cont. (33 MIP sel. tracks) MC Truth MIP track cont. (33 MIP sel. tracks) MC Truth EM cont. (1007 tracks, no MIP sel.) DATA (1208 MIP sel. tracks)

6

ATLAS work in progress tracks with p >1.5 GeV T

2.2 GeV < p < 2.8 GeV

7

7

2.2 GeV < p < 2.8 GeV

5

1.1 < η < 1.4

6

MC Reconstructed (41 MIP sel. tracks) MC Truth EM cont. (41 MIP sel. tracks) MC Truth MIP track cont. (41 MIP sel. tracks) MC Truth EM cont. (1061 tracks, no MIP sel.) DATA (1113 MIP sel. tracks)

-1.4 < η < -1.1

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.3

0.35

T

ρ/GeV

6

ATLAS work in progress

0

0.4 r

7

tracks with p >1.5 GeV

MC Reconstructed (295 MIP sel. tracks) MC Truth EM cont. (295 MIP sel. tracks) MC Truth MIP track cont. (295 MIP sel. tracks) MC Truth EM cont. (6084 tracks, no MIP sel.) DATA (8724 MIP sel. tracks)

6

3

3

2

2

1

1 0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

8

tracks with p >1.5 GeV T

0

0.4 r

10 9

MC Reconstructed (199 MIP sel. tracks) MC Truth EM cont. (199 MIP sel. tracks) MC Truth MIP track cont. (199 MIP sel. tracks) MC Truth EM cont. (3840 tracks, no MIP sel.) DATA (6153 MIP sel. tracks)

0.05

0.1

0.15

0.2

0.35

0.4 r

MC Reconstructed (276 MIP sel. tracks) MC Truth EM cont. (276 MIP sel. tracks) MC Truth MIP track cont. (276 MIP sel. tracks) MC Truth EM cont. (5977 tracks, no MIP sel.) DATA (8403 MIP sel. tracks)

0.25

0.3

0.35

0.4 r

7 6

ATLAS work in progress T

6

0.3

2.8 GeV < p < 3.6 GeV

MC Reconstructed (179 MIP sel. tracks) MC Truth EM cont. (179 MIP sel. tracks) MC Truth MIP track cont. (179 MIP sel. tracks) MC Truth EM cont. (3865 tracks, no MIP sel.) DATA (6133 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

5

1.1 < η < 1.4

0.25

-1.4 < η < -1.1

tracks with p >1.5 GeV

3.6 GeV < p < 4.6 GeV

7

0.2

T

4

0.1

0.15

ATLAS work in progress

5

1.1 < η < 1.4

0.05

0.1

7

4

0

0.05

tracks with p >1.5 GeV

2.8 GeV < p < 3.6 GeV

5

ρ/GeV

0.25

ρ/GeV

ρ/GeV

0

-1.4 < η < -1.1

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (110 MIP sel. tracks) MC Truth EM cont. (110 MIP sel. tracks) MC Truth MIP track cont. (110 MIP sel. tracks) MC Truth EM cont. (2071 tracks, no MIP sel.) DATA (3347 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

5

0

0.4 r

ρ/GeV

ρ/GeV

0

1.1 < η < 1.4

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.4 < η < -1.1

T

MC Reconstructed (112 MIP sel. tracks) MC Truth EM cont. (112 MIP sel. tracks) MC Truth MIP track cont. (112 MIP sel. tracks) MC Truth EM cont. (2171 tracks, no MIP sel.) DATA (3377 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

6

4

5 3

4 3

2

2 1 0

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

51

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Reconstructed (818 MIP sel. tracks) MC Truth EM cont. (818 MIP sel. tracks) MC Truth MIP track cont. (818 MIP sel. tracks) MC Truth EM cont. (16657 tracks, no MIP sel.) DATA (1669 MIP sel. tracks)

6

ATLAS work in progress tracks with p >1.5 GeV T

6.0 GeV < p < 10.0 GeV

7

7

6.0 GeV < p < 10.0 GeV

5

1.1 < η < 1.4

6

MC Reconstructed (834 MIP sel. tracks) MC Truth EM cont. (834 MIP sel. tracks) MC Truth MIP track cont. (834 MIP sel. tracks) MC Truth EM cont. (16558 tracks, no MIP sel.) DATA (1660 MIP sel. tracks)

-1.4 < η < -1.1

4

5 3

4 3

2

2 1

1

14

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

1.1 < η < 1.4

T

0.25

0.3

0.35

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Reconstructed (155 MIP sel. tracks) MC Truth EM cont. (155 MIP sel. tracks) MC Truth MIP track cont. (155 MIP sel. tracks) MC Truth EM cont. (3574 tracks, no MIP sel.) DATA (137 MIP sel. tracks)

10.0 GeV < p

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.4 < η < -1.1

T

MC Reconstructed (136 MIP sel. tracks) MC Truth EM cont. (136 MIP sel. tracks) MC Truth MIP track cont. (136 MIP sel. tracks) MC Truth EM cont. (3529 tracks, no MIP sel.) DATA (126 MIP sel. tracks)

10.0 GeV < p

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

0

ρ/GeV

ρ/GeV

0

MC Reconstructed (42 MIP sel. tracks) MC Truth EM cont. (42 MIP sel. tracks) MC Truth MIP track cont. (42 MIP sel. tracks) MC Truth EM cont. (796 tracks, no MIP sel.) DATA (1718 MIP sel. tracks)

0.1

0.15

0.2

6

ATLAS work in progress T

6

0.3

0.35

0.4 r

MC Reconstructed (61 MIP sel. tracks) MC Truth EM cont. (61 MIP sel. tracks) MC Truth MIP track cont. (61 MIP sel. tracks) MC Truth EM cont. (850 tracks, no MIP sel.) DATA (1607 MIP sel. tracks)

2.8 GeV < p < 3.6 GeV

5

1.4 < η < 1.5

0.25

7

tracks with p >1.5 GeV

2.8 GeV < p < 3.6 GeV

7

0.05

-1.5 < η < -1.4

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.4 < η < 1.5

T

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Reconstructed (122 MIP sel. tracks) MC Truth EM cont. (122 MIP sel. tracks) MC Truth MIP track cont. (122 MIP sel. tracks) MC Truth EM cont. (1851 tracks, no MIP sel.) DATA (4206 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

9

-1.5 < η < -1.4

5 4

3

3

2

2

1

1

0

0

0.25

0.3

0.35

0.4 r

ATLAS work in progress

7

4

0.2

0.2

8 6

0.15

0.15

tracks with p >1.5 GeV

5

0.1

0.1

0.25

0.3

0.35

0.4 r

10

6

0.05

0.05

T

MC Reconstructed (134 MIP sel. tracks) MC Truth EM cont. (134 MIP sel. tracks) MC Truth MIP track cont. (134 MIP sel. tracks) MC Truth EM cont. (1865 tracks, no MIP sel.) DATA (4024 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 14

ATLAS work in progress

12

tracks with p >1.5 GeV T

ρ/GeV

ρ/GeV

52 MC Reconstructed (69 MIP sel. tracks) MC Truth EM cont. (69 MIP sel. tracks) MC Truth MIP track cont. (69 MIP sel. tracks) MC Truth EM cont. (961 tracks, no MIP sel.) DATA (2345 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

10

1.4 < η < 1.5

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.5 < η < -1.4

T

MC Reconstructed (77 MIP sel. tracks) MC Truth EM cont. (77 MIP sel. tracks) MC Truth MIP track cont. (77 MIP sel. tracks) MC Truth EM cont. (1007 tracks, no MIP sel.) DATA (2232 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.4 < η < 1.5

T

ρ/GeV

10 9

0

MC Reconstructed (285 MIP sel. tracks) MC Truth EM cont. (285 MIP sel. tracks) MC Truth MIP track cont. (285 MIP sel. tracks) MC Truth EM cont. (4342 tracks, no MIP sel.) DATA (1122 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

9

4

3

3

2

2

1

1

0

0

0.25

0.3

0.35

0.4 r

20 18

ATLAS work in progress

16

tracks with p >1.5 GeV T

MC Reconstructed (82 MIP sel. tracks) MC Truth EM cont. (82 MIP sel. tracks) MC Truth MIP track cont. (82 MIP sel. tracks) MC Truth EM cont. (2256 tracks, no MIP sel.) DATA (68 MIP sel. tracks)

ATLAS work in progress

-1.5 < η < -1.4

5

0.2

0.25

0.3

0.35

0.4 r

14

T

MC Reconstructed (283 MIP sel. tracks) MC Truth EM cont. (283 MIP sel. tracks) MC Truth MIP track cont. (283 MIP sel. tracks) MC Truth EM cont. (4311 tracks, no MIP sel.) DATA (1130 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.5 < η < -1.4

T

10.0 GeV < p

14

0.2

7

4

0.15

0.15

8 6

0.1

0.1

tracks with p >1.5 GeV

5

0.05

0.05

10

6

ρ/GeV

ρ/GeV

ρ/GeV

0

0.25

0.3

0.35

0.4 r

MC Reconstructed (78 MIP sel. tracks) MC Truth EM cont. (78 MIP sel. tracks) MC Truth MIP track cont. (78 MIP sel. tracks) MC Truth EM cont. (2169 tracks, no MIP sel.) DATA (77 MIP sel. tracks)

10.0 GeV < p

1.4 < η < 1.5

12 8

10

6

8 6

4

4 2

2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (216 MIP sel. tracks) MC Truth EM cont. (216 MIP sel. tracks) MC Truth MIP track cont. (216 MIP sel. tracks) MC Truth EM cont. (3658 tracks, no MIP sel.) DATA (6845 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

5

0

0.4 r

ρ/GeV

ρ/GeV

0

1.5 < η < 1.8

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.8 < η < -1.5

T

MC Reconstructed (248 MIP sel. tracks) MC Truth EM cont. (248 MIP sel. tracks) MC Truth MIP track cont. (248 MIP sel. tracks) MC Truth EM cont. (3688 tracks, no MIP sel.) DATA (6403 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

6

4

5 3

4 3

2

2 1 0

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (195 MIP sel. tracks) MC Truth EM cont. (195 MIP sel. tracks) MC Truth MIP track cont. (195 MIP sel. tracks) MC Truth EM cont. (4419 tracks, no MIP sel.) DATA (6383 MIP sel. tracks)

7 6

T

4

3

3

2

2

1

1 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.5 < η < 1.8

T

ρ/GeV

10 9

0

0.4 r

MC Reconstructed (366 MIP sel. tracks) MC Truth EM cont. (366 MIP sel. tracks) MC Truth MIP track cont. (366 MIP sel. tracks) MC Truth EM cont. (6464 tracks, no MIP sel.) DATA (3557 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

9

4

3

3

2

2

1

1

0

0

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

MC Reconstructed (361 MIP sel. tracks) MC Truth EM cont. (361 MIP sel. tracks) MC Truth MIP track cont. (361 MIP sel. tracks) MC Truth EM cont. (11848 tracks, no MIP sel.) DATA (349 MIP sel. tracks)

ATLAS work in progress

0.25

0.3

0.35

0.4 r

14

T

MC Reconstructed (367 MIP sel. tracks) MC Truth EM cont. (367 MIP sel. tracks) MC Truth MIP track cont. (367 MIP sel. tracks) MC Truth EM cont. (6370 tracks, no MIP sel.) DATA (3279 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.8 < η < -1.5

T

10.0 GeV < p

7

0.2

-1.8 < η < -1.5

5

0.25

0.15

7

4

0.2

0.1

8 6

0.15

0.05

tracks with p >1.5 GeV

5

0.1

-1.8 < η < -1.5

10

6

0.05

MC Reconstructed (192 MIP sel. tracks) MC Truth EM cont. (192 MIP sel. tracks) MC Truth MIP track cont. (192 MIP sel. tracks) MC Truth EM cont. (4311 tracks, no MIP sel.) DATA (6067 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

5

1.5 < η < 1.8

0.05

ATLAS work in progress tracks with p >1.5 GeV

4.6 GeV < p < 6.0 GeV

4

0

ρ/GeV

ρ/GeV

7

5

ρ/GeV

53

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS

0.25

0.3

0.35

0.4 r

MC Reconstructed (354 MIP sel. tracks) MC Truth EM cont. (354 MIP sel. tracks) MC Truth MIP track cont. (354 MIP sel. tracks) MC Truth EM cont. (11860 tracks, no MIP sel.) DATA (321 MIP sel. tracks)

10.0 GeV < p

1.5 < η < 1.8

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (43 MIP sel. tracks) MC Truth EM cont. (43 MIP sel. tracks) MC Truth MIP track cont. (43 MIP sel. tracks) MC Truth EM cont. (1588 tracks, no MIP sel.) DATA (1443 MIP sel. tracks)

6

3

3

2

2

1

1 0.15

0.2

0.25

0.3

0.35

0.2

T

4

0.1

0.15

ATLAS work in progress

0.4 r

0.25

0.3

0.35

0.4 r

0

MC Reconstructed (46 MIP sel. tracks) MC Truth EM cont. (46 MIP sel. tracks) MC Truth MIP track cont. (46 MIP sel. tracks) MC Truth EM cont. (1618 tracks, no MIP sel.) DATA (1393 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

5

1.8 < η < 1.9

0.05

0.1

7

4

0

0.05

tracks with p >1.5 GeV

4.6 GeV < p < 6.0 GeV

5

0

0.4 r

ρ/GeV

ρ/GeV

0

-1.9 < η < -1.8

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS

6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (38 MIP sel. tracks) MC Truth EM cont. (38 MIP sel. tracks) MC Truth MIP track cont. (38 MIP sel. tracks) MC Truth EM cont. (1443 tracks, no MIP sel.) DATA (1076 MIP sel. tracks)

7 6

T

1.8 < η < 1.9

4

3

3

2

2

1

1

14

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

1.8 < η < 1.9

T

0.25

0.3

0.35

0

0.4 r

MC Reconstructed (36 MIP sel. tracks) MC Truth EM cont. (36 MIP sel. tracks) MC Truth MIP track cont. (36 MIP sel. tracks) MC Truth EM cont. (4840 tracks, no MIP sel.) DATA (75 MIP sel. tracks)

14

-1.9 < η < -1.8

0.05

0.1

12 10

-1.9 < η < -1.8

T

6

6

4

4

2

2 0.2

0.25

0.3

0.35

ATLAS work in progress tracks with p >1.5 GeV T

0

0.4 r

ρ/GeV

ρ/GeV

0.15

7 6

MC Reconstructed (22 MIP sel. tracks) MC Truth EM cont. (22 MIP sel. tracks) MC Truth MIP track cont. (22 MIP sel. tracks) MC Truth EM cont. (1185 tracks, no MIP sel.) DATA (966 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

5

0.25

0.3

0.35

0.4 r

MC Reconstructed (71 MIP sel. tracks) MC Truth EM cont. (71 MIP sel. tracks) MC Truth MIP track cont. (71 MIP sel. tracks) MC Truth EM cont. (4823 tracks, no MIP sel.) DATA (92 MIP sel. tracks)

10.0 GeV < p

8

0.1

0.2

tracks with p >1.5 GeV

8

0.05

0.15

ATLAS work in progress

10.0 GeV < p

0

MC Reconstructed (33 MIP sel. tracks) MC Truth EM cont. (33 MIP sel. tracks) MC Truth MIP track cont. (33 MIP sel. tracks) MC Truth EM cont. (1490 tracks, no MIP sel.) DATA (1065 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

5

4

0

ATLAS work in progress tracks with p >1.5 GeV

6.0 GeV < p < 10.0 GeV

5

ρ/GeV

ρ/GeV

7

ρ/GeV

ρ/GeV

54

1.9 < η < 2.3

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-2.3 < η < -1.9

T

MC Reconstructed (34 MIP sel. tracks) MC Truth EM cont. (34 MIP sel. tracks) MC Truth MIP track cont. (34 MIP sel. tracks) MC Truth EM cont. (1231 tracks, no MIP sel.) DATA (878 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

6

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.9 < η < 2.3

T

0

ρ/GeV

ρ/GeV

0

MC Reconstructed (173 MIP sel. tracks) MC Truth EM cont. (173 MIP sel. tracks) MC Truth MIP track cont. (173 MIP sel. tracks) MC Truth EM cont. (10232 tracks, no MIP sel.) DATA (5508 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

9

-2.3 < η < -1.9

5 4

3

3

2

2

1

1

0

0

0.25

0.3

0.35

0.4 r

ATLAS work in progress

7

4

0.2

0.2

8 6

0.15

0.15

tracks with p >1.5 GeV

5

0.1

0.1

0.25

0.3

0.35

0.4 r

10

6

0.05

0.05

T

MC Reconstructed (193 MIP sel. tracks) MC Truth EM cont. (193 MIP sel. tracks) MC Truth MIP track cont. (193 MIP sel. tracks) MC Truth EM cont. (10379 tracks, no MIP sel.) DATA (4912 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

55

30 ATLAS work in progress 25

tracks with p >1.5 GeV T

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Reconstructed (127 MIP sel. tracks) MC Truth EM cont. (127 MIP sel. tracks) MC Truth MIP track cont. (127 MIP sel. tracks) MC Truth EM cont. (23719 tracks, no MIP sel.) DATA (915 MIP sel. tracks)

10.0 GeV < p

20

1.9 < η < 2.3

20 18

ATLAS work in progress

16

tracks with p >1.5 GeV

14

-2.3 < η < -1.9

T

MC Reconstructed (161 MIP sel. tracks) MC Truth EM cont. (161 MIP sel. tracks) MC Truth MIP track cont. (161 MIP sel. tracks) MC Truth EM cont. (24159 tracks, no MIP sel.) DATA (845 MIP sel. tracks)

10.0 GeV < p

12 15

10 8

10

6 4

5

2 0

0.1

0.2

0.25

0.3

0.35

ATLAS work in progress

4

tracks with p >1.5 GeV T

ρ/GeV

5 4.5

0

0.4 r

MC Reconstructed (699 MIP sel. tracks) MC Truth EM cont. (699 MIP sel. tracks) MC Truth MIP track cont. (699 MIP sel. tracks) MC Truth EM cont. (7661 tracks, no MIP sel.) DATA (40556 MIP sel. tracks)

0.2

0.0 < η < 0.6

2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

4

tracks with p >1.5 GeV T

MC Reconstructed (1463 MIP sel. tracks) MC Truth EM cont. (1463 MIP sel. tracks) MC Truth MIP track cont. (1463 MIP sel. tracks) MC Truth EM cont. (13759 tracks, no MIP sel.) DATA (54049 MIP sel. tracks)

1.8 GeV < p < 2.2 GeV

3.5

0

0.4 r

5 ATLAS work in progress

0.25

0.3

0.35

0.4 r

2.5

2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.2

0.05

0.1

0.25

0.3

0.35

0.4 r

0.15

0.2

ATLAS work in progress

4 3

0.15

1.5 GeV < p < 1.8 GeV -0.6 < η < 0.0

tracks with p >1.5 GeV

0.25

0.3

0.35

0.4 r

T

0

MC Reconstructed (1506 MIP sel. tracks) MC Truth EM cont. (1506 MIP sel. tracks) MC Truth MIP track cont. (1506 MIP sel. tracks) MC Truth EM cont. (13661 tracks, no MIP sel.) DATA (55414 MIP sel. tracks)

1.8 GeV < p < 2.2 GeV

3.5

0.0 < η < 0.6

0.1

T

MC Reconstructed (721 MIP sel. tracks) MC Truth EM cont. (721 MIP sel. tracks) MC Truth MIP track cont. (721 MIP sel. tracks) MC Truth EM cont. (7698 tracks, no MIP sel.) DATA (41385 MIP sel. tracks)

5 4.5

3

0.05

tracks with p >1.5 GeV

3.5

2.5

0

0.15

ATLAS work in progress

4

1.5 GeV < p < 1.8 GeV

3

4.5

0.1

5 4.5

3

0

0.05

Linear approximation of the energy deposition density

3.5

ρ/GeV

0.15

ρ/GeV

ρ/GeV

C.2

0.05

-0.6 < η < 0.0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

0

0.4 r

MC Reconstructed (1293 MIP sel. tracks) MC Truth EM cont. (1293 MIP sel. tracks) MC Truth MIP track cont. (1293 MIP sel. tracks) MC Truth EM cont. (8416 tracks, no MIP sel.) DATA (25643 MIP sel. tracks)

ρ/GeV

0.1

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

4

tracks with p >1.5 GeV T

0

0.4 r

5 4.5

MC Reconstructed (8529 MIP sel. tracks) MC Truth EM cont. (8529 MIP sel. tracks) MC Truth MIP track cont. (8529 MIP sel. tracks) MC Truth EM cont. (46934 tracks, no MIP sel.) DATA (11253 MIP sel. tracks)

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (4551 MIP sel. tracks) MC Truth EM cont. (4551 MIP sel. tracks) MC Truth MIP track cont. (4551 MIP sel. tracks) MC Truth EM cont. (23892 tracks, no MIP sel.) DATA (4594 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

3.5

0

0.4 r

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0.3

0.35

0.4 r

T

MC Reconstructed (1419 MIP sel. tracks) MC Truth EM cont. (1419 MIP sel. tracks) MC Truth MIP track cont. (1419 MIP sel. tracks) MC Truth EM cont. (8454 tracks, no MIP sel.) DATA (26066 MIP sel. tracks)

2.8 GeV < p < 3.6 GeV -0.6 < η < 0.0

0.05

0.1

0.15

0.2

ATLAS work in progress tracks with p >1.5 GeV

0.25

0.3

0.35

0.4 r

T

MC Reconstructed (8794 MIP sel. tracks) MC Truth EM cont. (8794 MIP sel. tracks) MC Truth MIP track cont. (8794 MIP sel. tracks) MC Truth EM cont. (47000 tracks, no MIP sel.) DATA (11771 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV -0.6 < η < 0.0

0.05

0.1

0.15

0.2

ATLAS work in progress

4

3

0.05

0.25

0.25

0.3

0.35

0.4 r

5 4.5

2.5

0

0.2

tracks with p >1.5 GeV

tracks with p >1.5 GeV T

0

MC Reconstructed (4786 MIP sel. tracks) MC Truth EM cont. (4786 MIP sel. tracks) MC Truth MIP track cont. (4786 MIP sel. tracks) MC Truth EM cont. (23561 tracks, no MIP sel.) DATA (4572 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

3.5

0.0 < η < 0.6

0.15

ATLAS work in progress

3.5

0.0 < η < 0.6

0.05

0.1

5 4.5

2.5

0

0.05

4

3.6 GeV < p < 4.6 GeV

3.5

2.2 GeV < p < 2.8 GeV -0.6 < η < 0.0

3.5

0.0 < η < 0.6

0.05

T

MC Reconstructed (1471 MIP sel. tracks) MC Truth EM cont. (1471 MIP sel. tracks) MC Truth MIP track cont. (1471 MIP sel. tracks) MC Truth EM cont. (11583 tracks, no MIP sel.) DATA (45729 MIP sel. tracks)

5 4.5

2.5

0

tracks with p >1.5 GeV

4

2.8 GeV < p < 3.6 GeV

3.5

ρ/GeV

ρ/GeV

0.0 < η < 0.6

0.05

ATLAS work in progress

3.5

2.5

0

ρ/GeV

5 4.5 4

2.2 GeV < p < 2.8 GeV

3.5

ρ/GeV

MC Reconstructed (1400 MIP sel. tracks) MC Truth EM cont. (1400 MIP sel. tracks) MC Truth MIP track cont. (1400 MIP sel. tracks) MC Truth EM cont. (11348 tracks, no MIP sel.) DATA (44375 MIP sel. tracks)

ρ/GeV

C COLLECTION OF ALL PLOTS

ρ/GeV

ρ/GeV

56

-0.6 < η < 0.0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

57

7 6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (1825 MIP sel. tracks) MC Truth EM cont. (1825 MIP sel. tracks) MC Truth MIP track cont. (1825 MIP sel. tracks) MC Truth EM cont. (9628 tracks, no MIP sel.) DATA (1660 MIP sel. tracks)

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS ATLAS work in progress

4

6.0 GeV < p < 10.0 GeV

5

5 4.5

tracks with p >1.5 GeV T

6.0 GeV < p < 10.0 GeV

3.5

0.0 < η < 0.6

MC Reconstructed (2020 MIP sel. tracks) MC Truth EM cont. (2020 MIP sel. tracks) MC Truth MIP track cont. (2020 MIP sel. tracks) MC Truth EM cont. (9532 tracks, no MIP sel.) DATA (1751 MIP sel. tracks)

-0.6 < η < 0.0

3

4

2.5 3

2 1.5

2

1 1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

16

tracks with p >1.5 GeV

14

0.0 < η < 0.6

T

ρ/GeV

18

0

0.4 r

20 MC Reconstructed (159 MIP sel. tracks) MC Truth EM cont. (159 MIP sel. tracks) MC Truth MIP track cont. (159 MIP sel. tracks) MC Truth EM cont. (891 tracks, no MIP sel.) DATA (106 MIP sel. tracks)

10.0 GeV < p

18

8

6

6

4

4

2

2 0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

0

0.4 r

MC Reconstructed (313 MIP sel. tracks) MC Truth EM cont. (313 MIP sel. tracks) MC Truth MIP track cont. (313 MIP sel. tracks) MC Truth EM cont. (4487 tracks, no MIP sel.) DATA (12049 MIP sel. tracks)

T

0.05

0.1

0.3

0.35

0.4 r

MC Reconstructed (133 MIP sel. tracks) MC Truth EM cont. (133 MIP sel. tracks) MC Truth MIP track cont. (133 MIP sel. tracks) MC Truth EM cont. (863 tracks, no MIP sel.) DATA (109 MIP sel. tracks)

0.15

0.2

0.25

0.3

0.35

0.4 r

5 4.5

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (320 MIP sel. tracks) MC Truth EM cont. (320 MIP sel. tracks) MC Truth MIP track cont. (320 MIP sel. tracks) MC Truth EM cont. (4511 tracks, no MIP sel.) DATA (12354 MIP sel. tracks)

1.8 GeV < p < 2.2 GeV

3.5

0.6 < η < 1.1

0.25

10.0 GeV < p

4

1.8 GeV < p < 2.2 GeV

5

ATLAS work in progress

-0.6 < η < 0.0

10

0.2

0.2

14

8

0.15

0.15

16 12

0.1

0.1

tracks with p >1.5 GeV

10

0.05

0.05

20

12

0

ρ/GeV

0.5

ρ/GeV

ρ/GeV

0

-1.1 < η < -0.6

3

4

2.5 3

2 1.5

2

1 1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

tracks with p >1.5 GeV T

MC Reconstructed (693 MIP sel. tracks) MC Truth EM cont. (693 MIP sel. tracks) MC Truth MIP track cont. (693 MIP sel. tracks) MC Truth EM cont. (10430 tracks, no MIP sel.) DATA (22389 MIP sel. tracks)

0.05

0.1

0.15

0.2

6

ATLAS work in progress T

3

0.3

0.35

0.4 r

MC Reconstructed (695 MIP sel. tracks) MC Truth EM cont. (695 MIP sel. tracks) MC Truth MIP track cont. (695 MIP sel. tracks) MC Truth EM cont. (10180 tracks, no MIP sel.) DATA (23114 MIP sel. tracks)

2.2 GeV < p < 2.8 GeV

5

0.6 < η < 1.1

0.25

7

tracks with p >1.5 GeV

2.2 GeV < p < 2.8 GeV

3.5

0

0.4 r

ρ/GeV

ρ/GeV

0

0.5

-1.1 < η < -0.6

4

2.5 3

2 1.5

2

1 1

0.5 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS

6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (500 MIP sel. tracks) MC Truth EM cont. (500 MIP sel. tracks) MC Truth MIP track cont. (500 MIP sel. tracks) MC Truth EM cont. (6749 tracks, no MIP sel.) DATA (15672 MIP sel. tracks)

7 6

T

0.6 < η < 1.1

4

3

3

2

2

1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress tracks with p >1.5 GeV T

0

0.4 r

MC Reconstructed (746 MIP sel. tracks) MC Truth EM cont. (746 MIP sel. tracks) MC Truth MIP track cont. (746 MIP sel. tracks) MC Truth EM cont. (6597 tracks, no MIP sel.) DATA (7950 MIP sel. tracks)

-1.1 < η < -0.6

0.05

0.1

0.2

ATLAS work in progress tracks with p >1.5 GeV

0.25

0.3

0.35

0.4 r

T

MC Reconstructed (760 MIP sel. tracks) MC Truth EM cont. (760 MIP sel. tracks) MC Truth MIP track cont. (760 MIP sel. tracks) MC Truth EM cont. (6652 tracks, no MIP sel.) DATA (8251 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

3.5

0.6 < η < 1.1

0.15

5 4.5 4

3.6 GeV < p < 4.6 GeV

5

MC Reconstructed (549 MIP sel. tracks) MC Truth EM cont. (549 MIP sel. tracks) MC Truth MIP track cont. (549 MIP sel. tracks) MC Truth EM cont. (6921 tracks, no MIP sel.) DATA (16085 MIP sel. tracks)

2.8 GeV < p < 3.6 GeV

5

4

0

ATLAS work in progress tracks with p >1.5 GeV

2.8 GeV < p < 3.6 GeV

5

ρ/GeV

ρ/GeV

7

ρ/GeV

ρ/GeV

58

-1.1 < η < -0.6

3

4

2.5 3

2 1.5

2

1 1 0.1

0.15

0.2

0.3

0.35

6

ATLAS work in progress tracks with p >1.5 GeV T

0

0.4 r

7 MC Reconstructed (2501 MIP sel. tracks) MC Truth EM cont. (2501 MIP sel. tracks) MC Truth MIP track cont. (2501 MIP sel. tracks) MC Truth EM cont. (21425 tracks, no MIP sel.) DATA (3606 MIP sel. tracks)

6

3

3

2

2

1

1 0.15

0.2

0.25

0.3

0.35

6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (1629 MIP sel. tracks) MC Truth EM cont. (1629 MIP sel. tracks) MC Truth MIP track cont. (1629 MIP sel. tracks) MC Truth EM cont. (16152 tracks, no MIP sel.) DATA (1452 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

5

0

0.4 r

7

6

3

2

2

1

1 0.15

0.2

0.05

0.1

0.25

0.3

0.35

0.4 r

0.15

0.2

ATLAS work in progress T

3

0.1

0.35

0.4 r

MC Reconstructed (2676 MIP sel. tracks) MC Truth EM cont. (2676 MIP sel. tracks) MC Truth MIP track cont. (2676 MIP sel. tracks) MC Truth EM cont. (21439 tracks, no MIP sel.) DATA (3691 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

tracks with p >1.5 GeV

4

0.05

0.3

0.25

0.3

0.35

0.4 r

7

4

0

0.25

-1.1 < η < -0.6

0

MC Reconstructed (1732 MIP sel. tracks) MC Truth EM cont. (1732 MIP sel. tracks) MC Truth MIP track cont. (1732 MIP sel. tracks) MC Truth EM cont. (16093 tracks, no MIP sel.) DATA (1499 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

5

0.6 < η < 1.1

0.2

T

4

0.1

0.15

ATLAS work in progress

5

0.6 < η < 1.1

0.05

0.1

7

4

0

0.05

tracks with p >1.5 GeV

4.6 GeV < p < 6.0 GeV

5

ρ/GeV

0.25

ρ/GeV

0.05

ρ/GeV

ρ/GeV

0

0.5

-1.1 < η < -0.6

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

59

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Reconstructed (122 MIP sel. tracks) MC Truth EM cont. (122 MIP sel. tracks) MC Truth MIP track cont. (122 MIP sel. tracks) MC Truth EM cont. (1759 tracks, no MIP sel.) DATA (99 MIP sel. tracks)

14

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.1 < η < -0.6

T

10.0 GeV < p

7

MC Reconstructed (115 MIP sel. tracks) MC Truth EM cont. (115 MIP sel. tracks) MC Truth MIP track cont. (115 MIP sel. tracks) MC Truth EM cont. (1727 tracks, no MIP sel.) DATA (130 MIP sel. tracks)

10.0 GeV < p

0.6 < η < 1.1

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.1 < η < 1.4

T

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Reconstructed (33 MIP sel. tracks) MC Truth EM cont. (33 MIP sel. tracks) MC Truth MIP track cont. (33 MIP sel. tracks) MC Truth EM cont. (1007 tracks, no MIP sel.) DATA (1208 MIP sel. tracks)

0.05

0.1

0.15

0.2

6

ATLAS work in progress

0.35

0.4 r

T

MC Reconstructed (41 MIP sel. tracks) MC Truth EM cont. (41 MIP sel. tracks) MC Truth MIP track cont. (41 MIP sel. tracks) MC Truth EM cont. (1061 tracks, no MIP sel.) DATA (1113 MIP sel. tracks)

2.2 GeV < p < 2.8 GeV

5

6

0.3

7

tracks with p >1.5 GeV

2.2 GeV < p < 2.8 GeV

0.25

-1.4 < η < -1.1

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.3

0.35

tracks with p >1.5 GeV T

ρ/GeV

6

ATLAS work in progress

0

0.4 r

7 MC Reconstructed (295 MIP sel. tracks) MC Truth EM cont. (295 MIP sel. tracks) MC Truth MIP track cont. (295 MIP sel. tracks) MC Truth EM cont. (6084 tracks, no MIP sel.) DATA (8724 MIP sel. tracks)

6

3

3

2

2

1

1 0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.1 < η < 1.4

T

0

0.4 r

10 9

0.2

T

4

0.1

0.15

ATLAS work in progress

MC Reconstructed (199 MIP sel. tracks) MC Truth EM cont. (199 MIP sel. tracks) MC Truth MIP track cont. (199 MIP sel. tracks) MC Truth EM cont. (3840 tracks, no MIP sel.) DATA (6153 MIP sel. tracks)

0.05

0.1

0.35

0.4 r

MC Reconstructed (276 MIP sel. tracks) MC Truth EM cont. (276 MIP sel. tracks) MC Truth MIP track cont. (276 MIP sel. tracks) MC Truth EM cont. (5977 tracks, no MIP sel.) DATA (8403 MIP sel. tracks)

0.15

0.2

0.25

0.3

0.35

0.4 r

7 6

ATLAS work in progress T

MC Reconstructed (179 MIP sel. tracks) MC Truth EM cont. (179 MIP sel. tracks) MC Truth MIP track cont. (179 MIP sel. tracks) MC Truth EM cont. (3865 tracks, no MIP sel.) DATA (6133 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

5

6

0.3

-1.4 < η < -1.1

tracks with p >1.5 GeV

3.6 GeV < p < 4.6 GeV

0.25

2.8 GeV < p < 3.6 GeV

5

1.1 < η < 1.4

0.05

0.1

7

4

0

0.05

tracks with p >1.5 GeV

2.8 GeV < p < 3.6 GeV

5

ρ/GeV

0.25

ρ/GeV

ρ/GeV

0

-1.4 < η < -1.1

4

5 3

4 3

2

2 1

1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 7 6

ATLAS work in progress tracks with p >1.5 GeV T

ρ/GeV

ρ/GeV

60 MC Reconstructed (110 MIP sel. tracks) MC Truth EM cont. (110 MIP sel. tracks) MC Truth MIP track cont. (110 MIP sel. tracks) MC Truth EM cont. (2071 tracks, no MIP sel.) DATA (3347 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

5

1.1 < η < 1.4

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.4 < η < -1.1

T

MC Reconstructed (112 MIP sel. tracks) MC Truth EM cont. (112 MIP sel. tracks) MC Truth MIP track cont. (112 MIP sel. tracks) MC Truth EM cont. (2171 tracks, no MIP sel.) DATA (3377 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

6

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.1 < η < 1.4

T

0

ρ/GeV

ρ/GeV

0

MC Reconstructed (818 MIP sel. tracks) MC Truth EM cont. (818 MIP sel. tracks) MC Truth MIP track cont. (818 MIP sel. tracks) MC Truth EM cont. (16657 tracks, no MIP sel.) DATA (1669 MIP sel. tracks)

0.05

0.1

0.15

0.2

6

ATLAS work in progress

0.35

0.4 r

T

MC Reconstructed (834 MIP sel. tracks) MC Truth EM cont. (834 MIP sel. tracks) MC Truth MIP track cont. (834 MIP sel. tracks) MC Truth EM cont. (16558 tracks, no MIP sel.) DATA (1660 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

5

6

0.3

7

tracks with p >1.5 GeV

6.0 GeV < p < 10.0 GeV

0.25

-1.4 < η < -1.1

4

5 3

4 3

2

2 1

1

14

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV T

0.25

0.3

0.35

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Reconstructed (155 MIP sel. tracks) MC Truth EM cont. (155 MIP sel. tracks) MC Truth MIP track cont. (155 MIP sel. tracks) MC Truth EM cont. (3574 tracks, no MIP sel.) DATA (137 MIP sel. tracks)

10.0 GeV < p

10

1.1 < η < 1.4

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.4 < η < -1.1

T

MC Reconstructed (136 MIP sel. tracks) MC Truth EM cont. (136 MIP sel. tracks) MC Truth MIP track cont. (136 MIP sel. tracks) MC Truth EM cont. (3529 tracks, no MIP sel.) DATA (126 MIP sel. tracks)

10.0 GeV < p

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.4 < η < 1.5

T

0

ρ/GeV

ρ/GeV

0

MC Reconstructed (42 MIP sel. tracks) MC Truth EM cont. (42 MIP sel. tracks) MC Truth MIP track cont. (42 MIP sel. tracks) MC Truth EM cont. (796 tracks, no MIP sel.) DATA (1718 MIP sel. tracks)

0.05

0.1

0.15

0.2

6

ATLAS work in progress

0.35

0.4 r

T

MC Reconstructed (61 MIP sel. tracks) MC Truth EM cont. (61 MIP sel. tracks) MC Truth MIP track cont. (61 MIP sel. tracks) MC Truth EM cont. (850 tracks, no MIP sel.) DATA (1607 MIP sel. tracks)

2.8 GeV < p < 3.6 GeV

5

6

0.3

7

tracks with p >1.5 GeV

2.8 GeV < p < 3.6 GeV

0.25

-1.5 < η < -1.4

4

5 3

4 3

2

2 1

1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

9

ATLAS work in progress tracks with p >1.5 GeV T

ρ/GeV

10 8

MC Reconstructed (122 MIP sel. tracks) MC Truth EM cont. (122 MIP sel. tracks) MC Truth MIP track cont. (122 MIP sel. tracks) MC Truth EM cont. (1851 tracks, no MIP sel.) DATA (4206 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

7

ρ/GeV

61

1.4 < η < 1.5

10 9

tracks with p >1.5 GeV

7

-1.5 < η < -1.4

6

5

5

4

4

3

3

2

2

1

1

0

0

14

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

1.4 < η < 1.5

T

0.25

0.3

0.35

0.4 r

MC Reconstructed (69 MIP sel. tracks) MC Truth EM cont. (69 MIP sel. tracks) MC Truth MIP track cont. (69 MIP sel. tracks) MC Truth EM cont. (961 tracks, no MIP sel.) DATA (2345 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

ATLAS work in progress

8

6

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS

T

MC Reconstructed (134 MIP sel. tracks) MC Truth EM cont. (134 MIP sel. tracks) MC Truth MIP track cont. (134 MIP sel. tracks) MC Truth EM cont. (1865 tracks, no MIP sel.) DATA (4024 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.5 < η < -1.4

T

MC Reconstructed (77 MIP sel. tracks) MC Truth EM cont. (77 MIP sel. tracks) MC Truth MIP track cont. (77 MIP sel. tracks) MC Truth EM cont. (1007 tracks, no MIP sel.) DATA (2232 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.2

0.25

0.3

0.35

0.4 r

9

ATLAS work in progress tracks with p >1.5 GeV T

ρ/GeV

10 8

MC Reconstructed (285 MIP sel. tracks) MC Truth EM cont. (285 MIP sel. tracks) MC Truth MIP track cont. (285 MIP sel. tracks) MC Truth EM cont. (4342 tracks, no MIP sel.) DATA (1122 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

7

ρ/GeV

0.15

0

1.4 < η < 1.5

9

4

3

3

2

2

1

1

0

0

0.25

0.3

0.35

0.4 r

20 18

ATLAS work in progress

16

tracks with p >1.5 GeV

14

1.4 < η < 1.5

T

MC Reconstructed (82 MIP sel. tracks) MC Truth EM cont. (82 MIP sel. tracks) MC Truth MIP track cont. (82 MIP sel. tracks) MC Truth EM cont. (2256 tracks, no MIP sel.) DATA (68 MIP sel. tracks)

ATLAS work in progress

-1.5 < η < -1.4

5

0.2

0.2

tracks with p >1.5 GeV

4

0.15

0.15

7 6

0.1

0.1

8

5

0.05

0.05

0.25

0.3

0.35

0.4 r

10

6

ρ/GeV

ρ/GeV

0

14

T

MC Reconstructed (283 MIP sel. tracks) MC Truth EM cont. (283 MIP sel. tracks) MC Truth MIP track cont. (283 MIP sel. tracks) MC Truth EM cont. (4311 tracks, no MIP sel.) DATA (1130 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.5 < η < -1.4

T

10.0 GeV < p

0.25

0.3

0.35

0.4 r

MC Reconstructed (78 MIP sel. tracks) MC Truth EM cont. (78 MIP sel. tracks) MC Truth MIP track cont. (78 MIP sel. tracks) MC Truth EM cont. (2169 tracks, no MIP sel.) DATA (77 MIP sel. tracks)

10.0 GeV < p

12 8

10

6

8 6

4

4 2

2 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 7 6

ATLAS work in progress tracks with p >1.5 GeV T

ρ/GeV

ρ/GeV

62 MC Reconstructed (216 MIP sel. tracks) MC Truth EM cont. (216 MIP sel. tracks) MC Truth MIP track cont. (216 MIP sel. tracks) MC Truth EM cont. (3658 tracks, no MIP sel.) DATA (6845 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

5

1.5 < η < 1.8

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.8 < η < -1.5

T

MC Reconstructed (248 MIP sel. tracks) MC Truth EM cont. (248 MIP sel. tracks) MC Truth MIP track cont. (248 MIP sel. tracks) MC Truth EM cont. (3688 tracks, no MIP sel.) DATA (6403 MIP sel. tracks)

3.6 GeV < p < 4.6 GeV

6

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.35

0.4 r

T

ρ/GeV

6

ATLAS work in progress

MC Reconstructed (195 MIP sel. tracks) MC Truth EM cont. (195 MIP sel. tracks) MC Truth MIP track cont. (195 MIP sel. tracks) MC Truth EM cont. (4419 tracks, no MIP sel.) DATA (6383 MIP sel. tracks)

6

3

3

2

2

1

1 0.15

0.2

0.25

0.3

0.35

8

tracks with p >1.5 GeV T

ρ/GeV

ATLAS work in progress

0

0.4 r

10 9

MC Reconstructed (366 MIP sel. tracks) MC Truth EM cont. (366 MIP sel. tracks) MC Truth MIP track cont. (366 MIP sel. tracks) MC Truth EM cont. (6464 tracks, no MIP sel.) DATA (3557 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

7

1.5 < η < 1.8

9

4

3

3

2

2

1

1

0

0

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.5 < η < 1.8

T

MC Reconstructed (361 MIP sel. tracks) MC Truth EM cont. (361 MIP sel. tracks) MC Truth MIP track cont. (361 MIP sel. tracks) MC Truth EM cont. (11848 tracks, no MIP sel.) DATA (349 MIP sel. tracks)

0.1

0.15

0.2

ATLAS work in progress

-1.8 < η < -1.5

5

0.25

0.05

tracks with p >1.5 GeV

4

0.2

0.35

0.4 r

MC Reconstructed (192 MIP sel. tracks) MC Truth EM cont. (192 MIP sel. tracks) MC Truth MIP track cont. (192 MIP sel. tracks) MC Truth EM cont. (4311 tracks, no MIP sel.) DATA (6067 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

7 6

0.15

0.3

-1.8 < η < -1.5

8

5

0.1

0.25

0.25

0.3

0.35

0.4 r

10

6

0.05

0.2

T

4

0.1

0.15

ATLAS work in progress

5

1.5 < η < 1.8

0.05

0.1

7

4

0

0.05

tracks with p >1.5 GeV

4.6 GeV < p < 6.0 GeV

5

ρ/GeV

0.3

7

tracks with p >1.5 GeV

ρ/GeV

0.25

0

ρ/GeV

ρ/GeV

0

14

T

MC Reconstructed (367 MIP sel. tracks) MC Truth EM cont. (367 MIP sel. tracks) MC Truth MIP track cont. (367 MIP sel. tracks) MC Truth EM cont. (6370 tracks, no MIP sel.) DATA (3279 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.8 < η < -1.5

T

10.0 GeV < p

0.25

0.3

0.35

0.4 r

MC Reconstructed (354 MIP sel. tracks) MC Truth EM cont. (354 MIP sel. tracks) MC Truth MIP track cont. (354 MIP sel. tracks) MC Truth EM cont. (11860 tracks, no MIP sel.) DATA (321 MIP sel. tracks)

10.0 GeV < p

6 8

5

6

4 3

4

2 2

1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

6

ATLAS work in progress tracks with p >1.5 GeV T

MC Reconstructed (43 MIP sel. tracks) MC Truth EM cont. (43 MIP sel. tracks) MC Truth MIP track cont. (43 MIP sel. tracks) MC Truth EM cont. (1588 tracks, no MIP sel.) DATA (1443 MIP sel. tracks)

7 6

T

4

3

3

2

2

1

1 0.1

0.15

0.2

0.25

0.3

0.35

6

tracks with p >1.5 GeV T

ρ/GeV

7 ATLAS work in progress

0

0.4 r

MC Reconstructed (38 MIP sel. tracks) MC Truth EM cont. (38 MIP sel. tracks) MC Truth MIP track cont. (38 MIP sel. tracks) MC Truth EM cont. (1443 tracks, no MIP sel.) DATA (1076 MIP sel. tracks)

6

3

3

2

2

1

1

14

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV T

0.25

0.3

0.35

0

0.4 r

MC Reconstructed (36 MIP sel. tracks) MC Truth EM cont. (36 MIP sel. tracks) MC Truth MIP track cont. (36 MIP sel. tracks) MC Truth EM cont. (4840 tracks, no MIP sel.) DATA (75 MIP sel. tracks)

14

0.05

0.1

4

4

2

2 0.15

0.2

0.25

0.3

0.35

7 ATLAS work in progress tracks with p >1.5 GeV T

0

0.4 r

ρ/GeV

ρ/GeV

0.2

ATLAS work in progress

-1.9 < η < -1.8

6

MC Reconstructed (22 MIP sel. tracks) MC Truth EM cont. (22 MIP sel. tracks) MC Truth MIP track cont. (22 MIP sel. tracks) MC Truth EM cont. (1185 tracks, no MIP sel.) DATA (966 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

5

0.15

10

6

6

0.35

0.4 r

MC Reconstructed (33 MIP sel. tracks) MC Truth EM cont. (33 MIP sel. tracks) MC Truth MIP track cont. (33 MIP sel. tracks) MC Truth EM cont. (1490 tracks, no MIP sel.) DATA (1065 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

tracks with p >1.5 GeV

8

0.1

0.3

T

0.25

0.3

0.35

0.4 r

MC Reconstructed (71 MIP sel. tracks) MC Truth EM cont. (71 MIP sel. tracks) MC Truth MIP track cont. (71 MIP sel. tracks) MC Truth EM cont. (4823 tracks, no MIP sel.) DATA (92 MIP sel. tracks)

10.0 GeV < p

1.8 < η < 1.9

0.05

0.25

-1.9 < η < -1.8

12

8

0

0.2

ATLAS work in progress

10.0 GeV < p

10

0.15

T

4

0.1

0.1

5

1.8 < η < 1.9

0.05

0.05

7

4

0

-1.9 < η < -1.8

tracks with p >1.5 GeV

6.0 GeV < p < 10.0 GeV

5

MC Reconstructed (46 MIP sel. tracks) MC Truth EM cont. (46 MIP sel. tracks) MC Truth MIP track cont. (46 MIP sel. tracks) MC Truth EM cont. (1618 tracks, no MIP sel.) DATA (1393 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

5

1.8 < η < 1.9

0.05

ATLAS work in progress tracks with p >1.5 GeV

4.6 GeV < p < 6.0 GeV

4

0

ρ/GeV

ρ/GeV

7

5

ρ/GeV

63

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS

1.9 < η < 2.3

0.05

0.1

0.15

0.2

0.25

0.3

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0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-2.3 < η < -1.9

T

MC Reconstructed (34 MIP sel. tracks) MC Truth EM cont. (34 MIP sel. tracks) MC Truth MIP track cont. (34 MIP sel. tracks) MC Truth EM cont. (1231 tracks, no MIP sel.) DATA (878 MIP sel. tracks)

4.6 GeV < p < 6.0 GeV

6

4

5 3

4 3

2

2 1 0

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 9

ATLAS work in progress

8

tracks with p >1.5 GeV T

MC Reconstructed (173 MIP sel. tracks) MC Truth EM cont. (173 MIP sel. tracks) MC Truth MIP track cont. (173 MIP sel. tracks) MC Truth EM cont. (10232 tracks, no MIP sel.) DATA (5508 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

7

ρ/GeV

ρ/GeV

10

1.9 < η < 2.3

10 9

tracks with p >1.5 GeV

7

-2.3 < η < -1.9

6

5

5

4

4

3

3

2

2

1

1

0

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

30 ATLAS work in progress 25

tracks with p >1.5 GeV T

MC Reconstructed (127 MIP sel. tracks) MC Truth EM cont. (127 MIP sel. tracks) MC Truth MIP track cont. (127 MIP sel. tracks) MC Truth EM cont. (23719 tracks, no MIP sel.) DATA (915 MIP sel. tracks)

10.0 GeV < p

20

1.9 < η < 2.3

ATLAS work in progress

8

6

ρ/GeV

ρ/GeV

64

T

MC Reconstructed (193 MIP sel. tracks) MC Truth EM cont. (193 MIP sel. tracks) MC Truth MIP track cont. (193 MIP sel. tracks) MC Truth EM cont. (10379 tracks, no MIP sel.) DATA (4912 MIP sel. tracks)

6.0 GeV < p < 10.0 GeV

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

20 18

ATLAS work in progress

16

tracks with p >1.5 GeV

14

-2.3 < η < -1.9

T

MC Reconstructed (161 MIP sel. tracks) MC Truth EM cont. (161 MIP sel. tracks) MC Truth MIP track cont. (161 MIP sel. tracks) MC Truth EM cont. (24159 tracks, no MIP sel.) DATA (845 MIP sel. tracks)

10.0 GeV < p

12 15

10 8

10

6 4

5

2 0

0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

0.3

0.15

0.2

0.25

0.3

0.35

0.4 r

0.25

0.2

0.15

0.15

0.1

0.1

0.05

0.05

4000

0.1

-0.6 < η < 0.0

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

ATLAS work in progress E 1 (p) for tracks with p >1.5 GeV

0.0 < η < 0.6

0.2

0

0.1

0.35

T

0.25

0.05

Linear approximation of the energy deposition as a function of track momentum

0.35

0.3

0

0.4 r

E/GeV

E/GeV

C.3

0.05

6000

8000

10000

12000

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20000

p/MeV/c

0

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

4000

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14000

16000

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20000

p/MeV/c

65

0.35

0.3

E/GeV

E/GeV

C COLLECTION OF ALL PLOTS ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

0.35

0.3

T

0.25

0.25

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0.15

0.15

0.1

0.1

0.05

0.05

2000

4000

0.1

-1.1 < η < -0.6

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

0.2

0

ATLAS work in progress E 1 (p) for tracks with p >1.5 GeV

0.6 < η < 1.1

6000

8000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

4000

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12000

14000

16000

0.35

0.3

ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

0.3

0.25

0.2

0.15

0.15

0.1

0.1

0.05

0.05

4000

0.1

-1.4 < η < -1.1

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

ATLAS work in progress E 1 (p) for tracks with p >1.5 GeV

1.1 < η < 1.4

0.2

0

6000

8000

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12000

14000

16000

18000

20000

0

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

4000

6000

8000

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12000

14000

16000

0.7

ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

0.6

0.5

0.4

0.3

0.3

0.2

0.2

0.1

0.1

4000

0.1

-1.5 < η < -1.4

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

ATLAS work in progress E 1 (p) for tracks with p >1.5 GeV

1.4 < η < 1.5

0.4

0

6000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

4000

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0.7

ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

0.6

0.5

0.4

0.3

0.3

0.2

0.2

0.1

0.1

4000

0.1

-1.8 < η < -1.5

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

ATLAS work in progress E 1 (p) for tracks with p >1.5 GeV

1.5 < η < 1.8

0.4

0

20000

0.7

T

0.5

18000

p/MeV/c

E/GeV

E/GeV

p/MeV/c

0.6

20000

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T

0.5

18000

p/MeV/c

E/GeV

E/GeV

p/MeV/c

0.6

20000

0.35

T

0.25

18000

p/MeV/c

E/GeV

E/GeV

p/MeV/c

6000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

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p/MeV/c

C COLLECTION OF ALL PLOTS 0.35

0.3

E/GeV

E/GeV

66 ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

0.35

0.3

T

0.25

0.25

0.2

0.15

0.15

0.1

0.1

0.05

0.05

2000

4000

0.1

-1.9 < η < -1.8

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

0.2

0

ATLAS work in progress E 1 (p) for tracks with p >1.5 GeV

1.8 < η < 1.9

6000

8000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

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0.6

ATLAS work in progress 0.1

E 1 (p) for tracks with p >1.5 GeV

0.6

0.5

0.4

0.3

0.3

0.2

0.2

0.1

0.1

4000

0.1

-2.3 < η < -1.9

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

ATLAS work in progress E 1 (p) for tracks with p >1.5 GeV

1.9 < η < 2.3

0.4

0

6000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

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1 0.9

ATLAS work in progress

0.8

E 2 (p) for tracks with p >1.5 GeV

0.2

0.0 < η < 0.6

ATLAS work in progress

0.8

E 2 (p) for tracks with p >1.5 GeV

0.2

0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2

0.2

0.1

0.1

4000

-0.6 < η < 0.0

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

6000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

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12000

14000

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0.7

ATLAS work in progress 0.2

E 2 (p) for tracks with p >1.5 GeV

0.6

0.5

0.4

0.3

0.3

0.2

0.2

0.1

0.1

4000

0.2

-1.1 < η < -0.6

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

ATLAS work in progress E 2 (p) for tracks with p >1.5 GeV

0.6 < η < 1.1

0.4

0

20000

0.7

T

0.5

18000

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E/GeV

E/GeV

p/MeV/c

0.6

20000

1 0.9

T

0

18000

p/MeV/c

E/GeV

E/GeV

p/MeV/c

0.7

20000

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T

0.5

18000

p/MeV/c

E/GeV

E/GeV

p/MeV/c

6000

8000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

4000

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12000

14000

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p/MeV/c

67

1 0.9

ATLAS work in progress

0.8

E 2 (p) for tracks with p >1.5 GeV

E/GeV

E/GeV

C COLLECTION OF ALL PLOTS

0.2

1.1 < η < 1.4

1 0.9

ATLAS work in progress

0.8

E 2 (p) for tracks with p >1.5 GeV

0.2

T

0.7

0.7

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0.5

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

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ATLAS work in progress 0.2 E 2 (p)

for tracks with p >1.5 GeV

1.4 < η < 1.5

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0.8

0.6

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ATLAS work in progress E 2 (p) for tracks with p >1.5 GeV

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6000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

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ATLAS work in progress 0.2

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1.5 < η < 1.8

1.4

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0.8

0.6

0.6

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ATLAS work in progress E 2 (p) for tracks with p >1.5 GeV

-1.8 < η < -1.5

T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

0.8

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6000

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MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

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ATLAS work in progress 0.2

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0.6

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0.2

0.2

0.1

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0.2

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T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

2000

ATLAS work in progress E 2 (p) for tracks with p >1.5 GeV

1.8 < η < 1.9

0.4

0

20000

0.7

T

0.5

18000

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E/GeV

E/GeV

p/MeV/c

0.6

20000

0.2

1.2

T

1

18000

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E/GeV

p/MeV/c

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20000

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1.2

T

1

18000

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p/MeV/c

6000

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C COLLECTION OF ALL PLOTS 1.4

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68 ATLAS work in progress 0.2

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E 2 (p) for tracks with p >1.5 GeV

1.9 < η < 2.3

1.4

T

0.8

0.6

0.6

0.4

0.4

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0.2

2000

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6000

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E 2 (p) for tracks with p >1.5 GeV T

MC Reconstructed (MIP tracks) MC Truth EM (all tracks) DATA (MIP tracks)

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ATLAS work in progress 0.2

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8000

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ATLAS work in progress

1.6

MC Truth EM cont. (low RMS, 5535 tracks) MC Truth EM cont. (high RMS, 1357 tracks)

T

1.5 GeV < p < 1.8 GeV 0.0 < η < 0.6

1

1 0.8

0.6

0.6

0.4

0.4

0.2

0.2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

1.6

all tracks with p >1.5 GeV

1.4

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ATLAS work in progress

0

0.4 r

2 MC Truth EM cont. (low RMS, 9938 tracks) MC Truth EM cont. (high RMS, 2433 tracks)

T

1.8 GeV < p < 2.2 GeV

1.2

all tracks with p >1.5 GeV T

1.5 GeV < p < 1.8 GeV -0.6 < η < 0.0

0.05

0.1

0.15

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0.3

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2 1.8

ATLAS work in progress

1.6

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1.4

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MC Truth EM cont. (low RMS, 9905 tracks) MC Truth EM cont. (high RMS, 2373 tracks)

T

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1.2

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1

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0.8

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MC Truth EM cont. (low RMS, 5628 tracks) MC Truth EM cont. (high RMS, 1327 tracks)

1.2

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1.8

ATLAS work in progress

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1.2

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2 1.8 1.6

all tracks with p >1.5 GeV

1.4

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20000

Comparison of jet energy deposition density for wide and narrow clusters (radial RMS)

2 1.8

18000

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ρ/GeV

C.4

16000

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0.3

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0

0.05

0.1

0.15

0.2

0.25

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69

2 1.8

ATLAS work in progress

1.6

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C COLLECTION OF ALL PLOTS MC Truth EM cont. (low RMS, 7937 tracks) MC Truth EM cont. (high RMS, 2154 tracks)

all tracks with p >1.5 GeV T

2.2 GeV < p < 2.8 GeV

1.4

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1.2

ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

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MC Truth EM cont. (low RMS, 8169 tracks) MC Truth EM cont. (high RMS, 2136 tracks)

T

2.2 GeV < p < 2.8 GeV

1.2

1

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0.2

0

0.05

0.1

0.15

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3 ATLAS work in progress 2.5

0

0.4 r

ρ/GeV

ρ/GeV

2 1.8

MC Truth EM cont. (low RMS, 5552 tracks) MC Truth EM cont. (high RMS, 1752 tracks)

all tracks with p >1.5 GeV T

2.8 GeV < p < 3.6 GeV

2

0.0 < η < 0.6

0.05

0.1

0.15

0.2

0.25

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2 1.8

ATLAS work in progress

1.6

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1.4

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MC Truth EM cont. (low RMS, 5703 tracks) MC Truth EM cont. (high RMS, 1585 tracks)

T

2.8 GeV < p < 3.6 GeV

1.2 1.5

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0.6 0.4

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0.1

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3 ATLAS work in progress 2.5

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ρ/GeV

ρ/GeV

0

MC Truth EM cont. (low RMS, 29691 tracks) MC Truth EM cont. (high RMS, 9755 tracks)

all tracks with p >1.5 GeV

0.05

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ATLAS work in progress 2.5

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1

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ATLAS work in progress

4

MC Truth EM cont. (low RMS, 14001 tracks) MC Truth EM cont. (high RMS, 5234 tracks)

T

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3

3 2.5

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0.2

0.05

0.1

0.25

0.3

0.35

0.4 r

0.15

0.2

ATLAS work in progress

0.25

0.3

0.35

0.4 r

0

MC Truth EM cont. (low RMS, 14126 tracks) MC Truth EM cont. (high RMS, 4959 tracks)

all tracks with p >1.5 GeV T

4.6 GeV < p < 6.0 GeV

3.5

0.0 < η < 0.6

0.05

MC Truth EM cont. (low RMS, 30016 tracks) MC Truth EM cont. (high RMS, 9451 tracks)

5 4.5

2.5

0

0.4 r

-0.6 < η < 0.0

4

all tracks with p >1.5 GeV

3.5

0

0.4 r

ρ/GeV

ρ/GeV

0.15

0.35

T

1.5

0.1

0.3

3.6 GeV < p < 4.6 GeV

2

0.0 < η < 0.6

0.05

0.25

all tracks with p >1.5 GeV

T

0

0.2

3

3.6 GeV < p < 4.6 GeV

2

0.15

-0.6 < η < 0.0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS ATLAS work in progress

4

MC Truth EM cont. (low RMS, 5087 tracks) MC Truth EM cont. (high RMS, 2179 tracks)

5 4.5

T

6.0 GeV < p < 10.0 GeV 0.0 < η < 0.6

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5

14

0.05

0.1

0.15

0.2

ATLAS work in progress

12

all tracks with p >1.5 GeV

10

0.0 < η < 0.6

0.25

0.3

0.35

0

0.4 r

MC Truth EM cont. (low RMS, 399 tracks) MC Truth EM cont. (high RMS, 203 tracks)

T

14

T

6.0 GeV < p < 10.0 GeV -0.6 < η < 0.0

0.05

0.1

12 10

-0.6 < η < 0.0

6

6

4

4

2

2 0.2

0.25

0.3

0.35

ATLAS work in progress

1.6

0

0.4 r

ρ/GeV

ρ/GeV

0.15

2 1.8

MC Truth EM cont. (low RMS, 3216 tracks) MC Truth EM cont. (high RMS, 828 tracks)

all tracks with p >1.5 GeV T

1.8 GeV < p < 2.2 GeV

1.4

0.6 < η < 1.1

1.2

0.4 r

MC Truth EM cont. (low RMS, 394 tracks) MC Truth EM cont. (high RMS, 183 tracks)

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ATLAS work in progress all tracks with p >1.5 GeV

-1.1 < η < -0.6

MC Truth EM cont. (low RMS, 3230 tracks) MC Truth EM cont. (high RMS, 839 tracks)

T

1.8 GeV < p < 2.2 GeV

1.2 1

0.6

0.6

0.4

0.4

0.2

0.2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

2 ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

0.6 < η < 1.1

0

0.4 r

ρ/GeV

ρ/GeV

0.05

1.4

0.8

MC Truth EM cont. (low RMS, 7431 tracks) MC Truth EM cont. (high RMS, 1845 tracks)

T

2.2 GeV < p < 2.8 GeV

1.2

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

2 1.8

ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

-1.1 < η < -0.6

MC Truth EM cont. (low RMS, 7191 tracks) MC Truth EM cont. (high RMS, 1792 tracks)

T

2.2 GeV < p < 2.8 GeV

1.2

1

1

0.8

0.8

0.6

0.6

0.4

0.4

0.2

0.2

0

0.35

T

1.6

0.8

1.8

0.3

2 1.8

1

0

0.25

10.0 GeV < p

8

0.1

0.2

all tracks with p >1.5 GeV

8

0.05

0.15

ATLAS work in progress

10.0 GeV < p

0

MC Truth EM cont. (low RMS, 4979 tracks) MC Truth EM cont. (high RMS, 2123 tracks)

all tracks with p >1.5 GeV

3.5

2.5

0

ATLAS work in progress

4

all tracks with p >1.5 GeV

3.5

ρ/GeV

ρ/GeV

5 4.5

ρ/GeV

ρ/GeV

70

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

71

2 1.8

ATLAS work in progress

1.6

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Truth EM cont. (low RMS, 4614 tracks) MC Truth EM cont. (high RMS, 1297 tracks)

all tracks with p >1.5 GeV T

2.8 GeV < p < 3.6 GeV

1.4

0.6 < η < 1.1

1.2

ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

-1.1 < η < -0.6

MC Truth EM cont. (low RMS, 4713 tracks) MC Truth EM cont. (high RMS, 1368 tracks)

T

2.8 GeV < p < 3.6 GeV

1.2

1

1

0.8

0.8

0.6

0.6

0.4

0.4

0.2

0.2

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

3 ATLAS work in progress 2.5

0

0.4 r

ρ/GeV

ρ/GeV

2 1.8

MC Truth EM cont. (low RMS, 4103 tracks) MC Truth EM cont. (high RMS, 1378 tracks)

all tracks with p >1.5 GeV T

3.6 GeV < p < 4.6 GeV

2

0.6 < η < 1.1

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

2 1.8

ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

-1.1 < η < -0.6

MC Truth EM cont. (low RMS, 4103 tracks) MC Truth EM cont. (high RMS, 1425 tracks)

T

3.6 GeV < p < 4.6 GeV

1.2 1.5

1 0.8

1

0.6 0.4

0.5

0.2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

3 ATLAS work in progress 2.5

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Truth EM cont. (low RMS, 12135 tracks) MC Truth EM cont. (high RMS, 4943 tracks)

all tracks with p >1.5 GeV

0.05

0.1

ATLAS work in progress 2.5

1.5

1

1

0.5

0.5 0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

MC Truth EM cont. (low RMS, 8205 tracks) MC Truth EM cont. (high RMS, 4005 tracks)

T

6.0 GeV < p < 10.0 GeV

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.05

0.1

0.25

0.3

0.35

0.4 r

0.15

0.2

ATLAS work in progress

0.25

0.3

0.35

0.4 r

0

MC Truth EM cont. (low RMS, 8337 tracks) MC Truth EM cont. (high RMS, 3841 tracks)

all tracks with p >1.5 GeV T

6.0 GeV < p < 10.0 GeV

3.5

0.6 < η < 1.1

0.05

MC Truth EM cont. (low RMS, 12351 tracks) MC Truth EM cont. (high RMS, 4714 tracks)

5 4.5

2.5

0

0.4 r

-1.1 < η < -0.6

4

all tracks with p >1.5 GeV

3.5

0

0.4 r

ρ/GeV

ρ/GeV

0.15

0.35

T

1.5

0.1

0.3

4.6 GeV < p < 6.0 GeV

2

0.6 < η < 1.1

0.05

0.25

all tracks with p >1.5 GeV

T

0

0.2

3

4.6 GeV < p < 6.0 GeV

2

0.15

-1.1 < η < -0.6

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 10 9

ATLAS work in progress

8

ρ/GeV

ρ/GeV

72 MC Truth EM cont. (low RMS, 734 tracks) MC Truth EM cont. (high RMS, 471 tracks)

all tracks with p >1.5 GeV T

14

ATLAS work in progress

12

all tracks with p >1.5 GeV

10

-1.1 < η < -0.6

T

10.0 GeV < p

7

MC Truth EM cont. (low RMS, 767 tracks) MC Truth EM cont. (high RMS, 447 tracks)

10.0 GeV < p

0.6 < η < 1.1

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

2 1.8

ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

1.1 < η < 1.4

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Truth EM cont. (low RMS, 700 tracks) MC Truth EM cont. (high RMS, 201 tracks)

T

2.2 GeV < p < 2.8 GeV

1.2

-1.4 < η < -1.1

0.6

0.6

0.4

0.4

0.2

0.2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

2 ATLAS work in progress

0

0.4 r

ρ/GeV

ρ/GeV

0.25

0.3

0.35

0.4 r

MC Truth EM cont. (low RMS, 743 tracks) MC Truth EM cont. (high RMS, 193 tracks)

T

2.2 GeV < p < 2.8 GeV

1.2

1.6

MC Truth EM cont. (low RMS, 4162 tracks) MC Truth EM cont. (high RMS, 1196 tracks)

all tracks with p >1.5 GeV T

2.8 GeV < p < 3.6 GeV

1.4

1.1 < η < 1.4

1.2

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

2 1.8

ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

-1.4 < η < -1.1

MC Truth EM cont. (low RMS, 4153 tracks) MC Truth EM cont. (high RMS, 1114 tracks)

T

2.8 GeV < p < 3.6 GeV

1.2

1

1

0.8

0.8

0.6

0.6

0.4

0.4

0.2

0.2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

2 ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

1.1 < η < 1.4

0

0.4 r

ρ/GeV

ρ/GeV

ATLAS work in progress

1.4 1

1.8

0.2

1.6

0.8

0

0.15

all tracks with p >1.5 GeV

0.8

1.8

0.1

2 1.8

1

0

0.05

MC Truth EM cont. (low RMS, 2496 tracks) MC Truth EM cont. (high RMS, 818 tracks)

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

3 ATLAS work in progress 2.5

MC Truth EM cont. (low RMS, 2603 tracks) MC Truth EM cont. (high RMS, 749 tracks)

all tracks with p >1.5 GeV

T

T

3.6 GeV < p < 4.6 GeV

3.6 GeV < p < 4.6 GeV

2

-1.4 < η < -1.1

1.2 1.5

1 0.8

1

0.6 0.4

0.5

0.2 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

73

3 ATLAS work in progress 2.5

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Truth EM cont. (low RMS, 1274 tracks) MC Truth EM cont. (high RMS, 454 tracks)

all tracks with p >1.5 GeV

3 ATLAS work in progress 2.5

all tracks with p >1.5 GeV

T

T

4.6 GeV < p < 6.0 GeV

2

1.5

1

1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

0

0.4 r

ρ/GeV

ρ/GeV

4.6 GeV < p < 6.0 GeV

2

1.1 < η < 1.4

1.5

0

MC Truth EM cont. (low RMS, 8763 tracks) MC Truth EM cont. (high RMS, 4268 tracks)

all tracks with p >1.5 GeV

-1.4 < η < -1.1

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

3 ATLAS work in progress 2.5

MC Truth EM cont. (low RMS, 8898 tracks) MC Truth EM cont. (high RMS, 4135 tracks)

all tracks with p >1.5 GeV

T

T

6.0 GeV < p < 10.0 GeV

3.5

MC Truth EM cont. (low RMS, 1381 tracks) MC Truth EM cont. (high RMS, 461 tracks)

6.0 GeV < p < 10.0 GeV

2

1.1 < η < 1.4

-1.4 < η < -1.1

3 2.5

1.5

2 1

1.5 1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Truth EM cont. (low RMS, 1660 tracks) MC Truth EM cont. (high RMS, 921 tracks)

0.05

0.1

6

ATLAS work in progress

4

4

3

3

2

2

1

1 0.2

0.25

0.3

0.35

2 1.8

ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

1.4 < η < 1.5

0

0.4 r

ρ/GeV

ρ/GeV

0.15

0.35

0.4 r

MC Truth EM cont. (low RMS, 1678 tracks) MC Truth EM cont. (high RMS, 920 tracks)

10.0 GeV < p

5

1.1 < η < 1.4

0.1

0.3

T

10.0 GeV < p

0.05

0.25

all tracks with p >1.5 GeV

T

0

0.2

7

all tracks with p >1.5 GeV

5

0.15

MC Truth EM cont. (low RMS, 557 tracks) MC Truth EM cont. (high RMS, 144 tracks)

-1.4 < η < -1.1

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

3 ATLAS work in progress 2.5

MC Truth EM cont. (low RMS, 614 tracks) MC Truth EM cont. (high RMS, 135 tracks)

all tracks with p >1.5 GeV

T

T

2.8 GeV < p < 3.6 GeV

2.8 GeV < p < 3.6 GeV

2

-1.5 < η < -1.4

1.2 1.5

1 0.8

1

0.6 0.4

0.5

0.2 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 3 ATLAS work in progress 2.5

ρ/GeV

ρ/GeV

74 MC Truth EM cont. (low RMS, 1322 tracks) MC Truth EM cont. (high RMS, 277 tracks)

all tracks with p >1.5 GeV T

3.6 GeV < p < 4.6 GeV

2

1.4 < η < 1.5

2 1.8

ATLAS work in progress

1.6

all tracks with p >1.5 GeV

1.4

-1.5 < η < -1.4

MC Truth EM cont. (low RMS, 1352 tracks) MC Truth EM cont. (high RMS, 292 tracks)

T

3.6 GeV < p < 4.6 GeV

1.2 1.5

1 0.8

1

0.6 0.4

0.5

0.2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

3 ATLAS work in progress 2.5

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Truth EM cont. (low RMS, 678 tracks) MC Truth EM cont. (high RMS, 152 tracks)

0.1

T

4.6 GeV < p < 6.0 GeV

0.2

ATLAS work in progress

0.25

0.3

0.35

0.4 r

MC Truth EM cont. (low RMS, 733 tracks) MC Truth EM cont. (high RMS, 146 tracks)

all tracks with p >1.5 GeV T

4.6 GeV < p < 6.0 GeV

3.5

1.4 < η < 1.5

0.15

5 4.5 4

all tracks with p >1.5 GeV

2

0.05

-1.5 < η < -1.4

3 2.5

1.5

2 1

1.5 1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Truth EM cont. (low RMS, 2754 tracks) MC Truth EM cont. (high RMS, 837 tracks)

0.1

T

6.0 GeV < p < 10.0 GeV

0.2

ATLAS work in progress

0.25

0.3

0.35

0.4 r

MC Truth EM cont. (low RMS, 2759 tracks) MC Truth EM cont. (high RMS, 833 tracks)

all tracks with p >1.5 GeV T

6.0 GeV < p < 10.0 GeV

3.5

1.4 < η < 1.5

0.15

5 4.5 4

all tracks with p >1.5 GeV

5

0.05

-1.5 < η < -1.4

3

4

2.5 3

2 1.5

2

1 1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

10 9

ATLAS work in progress

8

all tracks with p >1.5 GeV

7

1.4 < η < 1.5

0

0.4 r

ρ/GeV

ρ/GeV

0

0.5

MC Truth EM cont. (low RMS, 1294 tracks) MC Truth EM cont. (high RMS, 489 tracks)

T

10.0 GeV < p

9

-1.5 < η < -1.4

5 4

3

3

2

2

1

1

0

0

0.25

0.3

0.35

0.4 r

ATLAS work in progress

7

4

0.2

0.2

8 6

0.15

0.15

all tracks with p >1.5 GeV

5

0.1

0.1

0.25

0.3

0.35

0.4 r

10

6

0.05

0.05

MC Truth EM cont. (low RMS, 1258 tracks) MC Truth EM cont. (high RMS, 474 tracks)

T

10.0 GeV < p

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

75

7 6

ATLAS work in progress

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Truth EM cont. (low RMS, 61 tracks) MC Truth EM cont. (high RMS, 13 tracks)

all tracks with p >1.5 GeV T

all tracks with p >1.5 GeV

10

-1.8 < η < -1.5

6

2

4

1

2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

1.6

all tracks with p >1.5 GeV

1.4

1.5 < η < 1.8

ρ/GeV

ATLAS work in progress

0

0.4 r

2 1.8

MC Truth EM cont. (low RMS, 2764 tracks) MC Truth EM cont. (high RMS, 573 tracks)

T

3.6 GeV < p < 4.6 GeV

1.2

0.05

0.1

ATLAS work in progress

1.6 1.4

-1.8 < η < -1.5

0.3

0.35

0.4 r

MC Truth EM cont. (low RMS, 2731 tracks) MC Truth EM cont. (high RMS, 615 tracks)

T

3.6 GeV < p < 4.6 GeV

1

0.6

0.6

0.4

0.4

0.2

0.2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

2.5

ρ/GeV

3 ATLAS work in progress

0

0.4 r

MC Truth EM cont. (low RMS, 3282 tracks) MC Truth EM cont. (high RMS, 751 tracks)

all tracks with p >1.5 GeV

0.05

0.1

1

1

0.5

0.5 0.2

0.25

0.3

0.35

ρ/GeV

2.5

0

0.4 r

3 ATLAS work in progress

MC Truth EM cont. (low RMS, 4311 tracks) MC Truth EM cont. (high RMS, 1410 tracks)

all tracks with p >1.5 GeV

0.05

0.1

0.25

0.3

0.35

0.4 r

MC Truth EM cont. (low RMS, 4243 tracks) MC Truth EM cont. (high RMS, 1361 tracks)

all tracks with p >1.5 GeV T

2

1

1

0.5

0.5 0.2

0.2

6.0 GeV < p < 10.0 GeV

1.5

0.15

0.15

ATLAS work in progress 2.5

1.5

0.1

MC Truth EM cont. (low RMS, 3170 tracks) MC Truth EM cont. (high RMS, 752 tracks)

3

T

1.5 < η < 1.8

0.05

0.4 r

-1.8 < η < -1.5

6.0 GeV < p < 10.0 GeV

2

0.35

T

1.5

0.15

0.3

4.6 GeV < p < 6.0 GeV

1.5

0.1

0.25

all tracks with p >1.5 GeV

2

1.5 < η < 1.8

0.05

0.2

ATLAS work in progress 2.5

T

2

0.15

3

4.6 GeV < p < 6.0 GeV

ρ/GeV

0.25

1.2 0.8

0

0.2

all tracks with p >1.5 GeV

0.8

0

0.15

2 1.8

1

0

T

8

3

ρ/GeV

12

MC Truth EM cont. (low RMS, 63 tracks) MC Truth EM cont. (high RMS, 12 tracks)

2.8 GeV < p < 3.6 GeV

1.5 < η < 1.8

4

0

ATLAS work in progress

2.8 GeV < p < 3.6 GeV

5

ρ/GeV

14

0.25

0.3

0.35

0.4 r

0

-1.8 < η < -1.5

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS ATLAS work in progress

4

MC Truth EM cont. (low RMS, 7443 tracks) MC Truth EM cont. (high RMS, 2876 tracks)

5 4.5

T

10.0 GeV < p 1.5 < η < 1.8

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

3 ATLAS work in progress 2.5

0

0.4 r

MC Truth EM cont. (low RMS, 1306 tracks) MC Truth EM cont. (high RMS, 206 tracks)

all tracks with p >1.5 GeV

T

10.0 GeV < p -1.8 < η < -1.5

0.05

0.1

1.5

1

1

0.5

0.5 0.25

0.3

0.35

7 6

ATLAS work in progress

0

0.4 r

ρ/GeV

ρ/GeV

0.2

MC Truth EM cont. (low RMS, 1129 tracks) MC Truth EM cont. (high RMS, 210 tracks)

0.4 r

MC Truth EM cont. (low RMS, 1354 tracks) MC Truth EM cont. (high RMS, 177 tracks)

-1.9 < η < -1.8

0.05

0.1

T

6.0 GeV < p < 10.0 GeV

0.2

ATLAS work in progress

0.25

0.3

0.35

0.4 r

MC Truth EM cont. (low RMS, 1140 tracks) MC Truth EM cont. (high RMS, 233 tracks)

all tracks with p >1.5 GeV T

6.0 GeV < p < 10.0 GeV

3.5

1.8 < η < 1.9

0.15

5 4.5 4

all tracks with p >1.5 GeV

5

0.35

all tracks with p >1.5 GeV

2

0.15

0.3

T

1.5

0.1

0.25

4.6 GeV < p < 6.0 GeV

1.8 < η < 1.9

0.05

0.2

ATLAS work in progress 2.5

T

0

0.15

3

4.6 GeV < p < 6.0 GeV

2

MC Truth EM cont. (low RMS, 7367 tracks) MC Truth EM cont. (high RMS, 2991 tracks)

all tracks with p >1.5 GeV

3.5

2.5

0

ATLAS work in progress

4

all tracks with p >1.5 GeV

3.5

ρ/GeV

ρ/GeV

5 4.5

ρ/GeV

ρ/GeV

76

-1.9 < η < -1.8

3

4

2.5 3

2 1.5

2

1 1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

MC Truth EM cont. (low RMS, 3484 tracks) MC Truth EM cont. (high RMS, 959 tracks)

T

10.0 GeV < p

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0.15

0.2

ATLAS work in progress

0.25

0.3

0.35

0.4 r

0

MC Truth EM cont. (low RMS, 3367 tracks) MC Truth EM cont. (high RMS, 964 tracks)

all tracks with p >1.5 GeV T

10.0 GeV < p

3.5

1.8 < η < 1.9

0.05

0.1

5 4.5

2.5

0

0.05

4

all tracks with p >1.5 GeV

3.5

0

0.4 r

ρ/GeV

ρ/GeV

0

0.5

-1.9 < η < -1.8

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ATLAS work in progress

4

ρ/GeV

5 4.5

MC Truth EM cont. (low RMS, 1026 tracks) MC Truth EM cont. (high RMS, 112 tracks)

5 4.5

T

4.6 GeV < p < 6.0 GeV 1.9 < η < 2.3

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

0

0.4 r

MC Truth EM cont. (low RMS, 9051 tracks) MC Truth EM cont. (high RMS, 968 tracks)

T

4.6 GeV < p < 6.0 GeV -2.3 < η < -1.9

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

7 6

ATLAS work in progress

all tracks with p >1.5 GeV

MC Truth EM cont. (low RMS, 9243 tracks) MC Truth EM cont. (high RMS, 942 tracks)

all tracks with p >1.5 GeV

T

T

6.0 GeV < p < 10.0 GeV

3.5

MC Truth EM cont. (low RMS, 1053 tracks) MC Truth EM cont. (high RMS, 142 tracks)

all tracks with p >1.5 GeV

3.5

2.5

0

ATLAS work in progress

4

all tracks with p >1.5 GeV

3.5

ρ/GeV

77

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS

6.0 GeV < p < 10.0 GeV

5

1.9 < η < 2.3

3

-2.3 < η < -1.9

4

2.5 3

2 1.5

2

1 1

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

10 9

ATLAS work in progress

8

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Truth EM cont. (low RMS, 20059 tracks) MC Truth EM cont. (high RMS, 3065 tracks)

14

0.05

0.1

T

0.2

ATLAS work in progress

12

all tracks with p >1.5 GeV

0.25

0.3

0.35

0.4 r

MC Truth EM cont. (low RMS, 20247 tracks) MC Truth EM cont. (high RMS, 3255 tracks)

all tracks with p >1.5 GeV T

10.0 GeV < p

7

0.15

10.0 GeV < p

10

1.9 < η < 2.3

-2.3 < η < -1.9

6 8

5

6

4 3

4

2 2

1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

78

C COLLECTION OF ALL PLOTS

Background estimation ATLAS work in progress

4

5 4.5

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

4

ρ/GeV

5 4.5

0

0.4 r

MC Reconstructed (1463 MIP sel. tracks) MC Truth EM cont. (13759 tracks, no MIP sel.)

T

1.8 GeV < p < 2.2 GeV

3

2.5

2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

4

0

0.4 r

5 4.5

0.1

MC Reconstructed (1400 MIP sel. tracks) MC Truth EM cont. (11348 tracks, no MIP sel.)

tracks with p >1.5 GeV

0.2

0.25

0.3

0.35

0.4 r

MC Reconstructed (1506 MIP sel. tracks) MC Truth EM cont. (13661 tracks, no MIP sel.)

tracks with p >1.5 GeV T

1.8 GeV < p < 2.2 GeV -0.6 < η < 0.0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

3 ATLAS work in progress 2.5

MC Reconstructed (1471 MIP sel. tracks) MC Truth EM cont. (11583 tracks, no MIP sel.)

tracks with p >1.5 GeV

T

T

2.2 GeV < p < 2.8 GeV

3.5

0.15

ATLAS work in progress

3.5

0.0 < η < 0.6

0.05

0.05

5 4.5

3

0

T

1.5 GeV < p < 1.8 GeV -0.6 < η < 0.0

4

tracks with p >1.5 GeV

3.5

MC Reconstructed (721 MIP sel. tracks) MC Truth EM cont. (7698 tracks, no MIP sel.)

tracks with p >1.5 GeV

3.5

0.0 < η < 0.6

0.05

ATLAS work in progress

4

T

1.5 GeV < p < 1.8 GeV

2.5

0

ρ/GeV

MC Reconstructed (699 MIP sel. tracks) MC Truth EM cont. (7661 tracks, no MIP sel.)

tracks with p >1.5 GeV

3.5

ρ/GeV

ρ/GeV

5 4.5

ρ/GeV

ρ/GeV

C.5

2.2 GeV < p < 2.8 GeV

2

0.0 < η < 0.6

-0.6 < η < 0.0

3 2.5

1.5

2 1

1.5 1

0.5

0.5 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ATLAS work in progress

4

5 4.5

T

2.8 GeV < p < 3.6 GeV

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

4

ρ/GeV

5 4.5

0

0.4 r

MC Reconstructed (8529 MIP sel. tracks) MC Truth EM cont. (46934 tracks, no MIP sel.)

T

3.6 GeV < p < 4.6 GeV

3.5 3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

4

0

0.4 r

5 4.5

MC Reconstructed (4551 MIP sel. tracks) MC Truth EM cont. (23892 tracks, no MIP sel.)

T

4.6 GeV < p < 6.0 GeV

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress

MC Reconstructed (1825 MIP sel. tracks) MC Truth EM cont. (9628 tracks, no MIP sel.)

T

6.0 GeV < p < 10.0 GeV

0.35

0.4 r

MC Reconstructed (8794 MIP sel. tracks) MC Truth EM cont. (47000 tracks, no MIP sel.)

T

3.6 GeV < p < 4.6 GeV

0.05

0.1

0.15

0.2

ATLAS work in progress

0.25

0.3

0.35

0.4 r

MC Reconstructed (4786 MIP sel. tracks) MC Truth EM cont. (23561 tracks, no MIP sel.)

tracks with p >1.5 GeV T

4.6 GeV < p < 6.0 GeV -0.6 < η < 0.0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

5 4.5

ATLAS work in progress

MC Reconstructed (2020 MIP sel. tracks) MC Truth EM cont. (9532 tracks, no MIP sel.)

tracks with p >1.5 GeV T

6.0 GeV < p < 10.0 GeV

3.5

0.0 < η < 0.6

0.3

-0.6 < η < 0.0

4

tracks with p >1.5 GeV

5

0

0.4 r

0.25

5 4.5

2.5

0

0.2

tracks with p >1.5 GeV

3.5

0.0 < η < 0.6

0.15

ATLAS work in progress

4

tracks with p >1.5 GeV

3.5

0.1

3.5

0.0 < η < 0.6

0.05

0.05

5 4.5

2.5

0

T

2.8 GeV < p < 3.6 GeV -0.6 < η < 0.0

4

tracks with p >1.5 GeV

MC Reconstructed (1419 MIP sel. tracks) MC Truth EM cont. (8454 tracks, no MIP sel.)

tracks with p >1.5 GeV

3.5

0.0 < η < 0.6

0.05

ATLAS work in progress

4

tracks with p >1.5 GeV

ρ/GeV

ρ/GeV

MC Reconstructed (1293 MIP sel. tracks) MC Truth EM cont. (8416 tracks, no MIP sel.)

2.5

0

ρ/GeV

ρ/GeV

5 4.5 3.5

ρ/GeV

79

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS

-0.6 < η < 0.0

3

4

2.5 3

2 1.5

2

1 1 0

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 18

ATLAS work in progress

16

MC Reconstructed (159 MIP sel. tracks) MC Truth EM cont. (891 tracks, no MIP sel.)

tracks with p >1.5 GeV T

10.0 GeV < p

14

0.0 < η < 0.6

20 18

tracks with p >1.5 GeV

14

-0.6 < η < 0.0

12

10

10

8

8

6

6

4

4

2

2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress

0

0.4 r

MC Reconstructed (313 MIP sel. tracks) MC Truth EM cont. (4487 tracks, no MIP sel.)

T

1.8 GeV < p < 2.2 GeV

T

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

5 4.5

ATLAS work in progress

MC Reconstructed (320 MIP sel. tracks) MC Truth EM cont. (4511 tracks, no MIP sel.)

tracks with p >1.5 GeV T

1.8 GeV < p < 2.2 GeV

3.5

0.6 < η < 1.1

MC Reconstructed (133 MIP sel. tracks) MC Truth EM cont. (863 tracks, no MIP sel.)

10.0 GeV < p

4

tracks with p >1.5 GeV

5

ATLAS work in progress

16

12

0

ρ/GeV

ρ/GeV

20

ρ/GeV

ρ/GeV

80

-1.1 < η < -0.6

3

4

2.5 3

2 1.5

2

1 1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

0

0.4 r

ρ/GeV

ρ/GeV

0

0.5

MC Reconstructed (693 MIP sel. tracks) MC Truth EM cont. (10430 tracks, no MIP sel.)

0.05

0.1

0.2

0.25

0.3

0.35

0.4 r

7 6

ATLAS work in progress

tracks with p >1.5 GeV

MC Reconstructed (695 MIP sel. tracks) MC Truth EM cont. (10180 tracks, no MIP sel.)

tracks with p >1.5 GeV

T

T

2.2 GeV < p < 2.8 GeV

3.5

0.15

2.2 GeV < p < 2.8 GeV

5

0.6 < η < 1.1

3

-1.1 < η < -0.6

4

2.5 3

2 1.5

2

1 1

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress

MC Reconstructed (500 MIP sel. tracks) MC Truth EM cont. (6749 tracks, no MIP sel.)

0.05

0.1

T

2.8 GeV < p < 3.6 GeV

0.2

ATLAS work in progress

0.25

0.3

0.35

0.4 r

MC Reconstructed (549 MIP sel. tracks) MC Truth EM cont. (6921 tracks, no MIP sel.)

tracks with p >1.5 GeV T

2.8 GeV < p < 3.6 GeV

3.5

0.6 < η < 1.1

0.15

5 4.5 4

tracks with p >1.5 GeV

5

0

0.4 r

ρ/GeV

ρ/GeV

0

-1.1 < η < -0.6

3

4

2.5 3

2 1.5

2

1 1 0

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

81

7 6

ATLAS work in progress

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Reconstructed (746 MIP sel. tracks) MC Truth EM cont. (6597 tracks, no MIP sel.)

ATLAS work in progress

4

tracks with p >1.5 GeV T

3.6 GeV < p < 4.6 GeV

5

5 4.5

tracks with p >1.5 GeV T

3.6 GeV < p < 4.6 GeV

3.5

0.6 < η < 1.1

MC Reconstructed (760 MIP sel. tracks) MC Truth EM cont. (6652 tracks, no MIP sel.)

-1.1 < η < -0.6

3

4

2.5 3

2 1.5

2

1 1

0.5 0.05

0.1

0.2

0.25

0.3

0.35

4

ρ/GeV

ATLAS work in progress

0

0.4 r

5 4.5

MC Reconstructed (2501 MIP sel. tracks) MC Truth EM cont. (21425 tracks, no MIP sel.)

T

4.6 GeV < p < 6.0 GeV

3

3 2.5

2

2

1.5

1.5

1

1

0.5

0.5 0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress

0

0.4 r

MC Reconstructed (1629 MIP sel. tracks) MC Truth EM cont. (16152 tracks, no MIP sel.)

6

3

3

2

2

1

1 0.3

0.35

ATLAS work in progress

8

tracks with p >1.5 GeV

7

0.6 < η < 1.1

0

0.4 r

ρ/GeV

ρ/GeV

0.25

10 9

MC Reconstructed (2676 MIP sel. tracks) MC Truth EM cont. (21439 tracks, no MIP sel.)

T

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ATLAS work in progress

MC Reconstructed (1732 MIP sel. tracks) MC Truth EM cont. (16093 tracks, no MIP sel.)

T

4

0.2

0.4 r

7

4

0.15

0.35

4.6 GeV < p < 6.0 GeV

6.0 GeV < p < 10.0 GeV

5

0.6 < η < 1.1

0.1

0.3

tracks with p >1.5 GeV

6.0 GeV < p < 10.0 GeV

0.05

0.25

-1.1 < η < -0.6

T

0

0.2

tracks with p >1.5 GeV

tracks with p >1.5 GeV

5

0.15

ATLAS work in progress

3.5

0.6 < η < 1.1

0.05

0.1

5 4.5

2.5

0

0.05

4

tracks with p >1.5 GeV

3.5

ρ/GeV

0.15

ρ/GeV

ρ/GeV

0

MC Reconstructed (122 MIP sel. tracks) MC Truth EM cont. (1759 tracks, no MIP sel.)

T

14

-1.1 < η < -0.6

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.1 < η < -0.6

0.25

0.3

0.35

0.4 r

MC Reconstructed (115 MIP sel. tracks) MC Truth EM cont. (1727 tracks, no MIP sel.)

T

10.0 GeV < p

10.0 GeV < p

6 8

5

6

4 3

4

2 2

1 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 5 4.5

ATLAS work in progress

4

ρ/GeV

ρ/GeV

82 MC Reconstructed (33 MIP sel. tracks) MC Truth EM cont. (1007 tracks, no MIP sel.)

tracks with p >1.5 GeV

3 ATLAS work in progress 2.5

tracks with p >1.5 GeV

T

T

2.2 GeV < p < 2.8 GeV

3.5

MC Reconstructed (41 MIP sel. tracks) MC Truth EM cont. (1061 tracks, no MIP sel.)

2.2 GeV < p < 2.8 GeV

2

1.1 < η < 1.4

-1.4 < η < -1.1

3 2.5

1.5

2 1

1.5 1

0.5

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

7 6

ATLAS work in progress

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Reconstructed (295 MIP sel. tracks) MC Truth EM cont. (6084 tracks, no MIP sel.)

0.05

0.1

6

ATLAS work in progress

4

3

3

2

2

1

1 0.2

0.25

0.3

0.35

10 9

ATLAS work in progress

8

0

0.4 r

ρ/GeV

ρ/GeV

0.15

0.4 r

MC Reconstructed (276 MIP sel. tracks) MC Truth EM cont. (5977 tracks, no MIP sel.)

MC Reconstructed (199 MIP sel. tracks) MC Truth EM cont. (3840 tracks, no MIP sel.)

-1.4 < η < -1.1

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

7 6

ATLAS work in progress

tracks with p >1.5 GeV

MC Reconstructed (179 MIP sel. tracks) MC Truth EM cont. (3865 tracks, no MIP sel.)

tracks with p >1.5 GeV

T

T

3.6 GeV < p < 4.6 GeV

7

0.35

2.8 GeV < p < 3.6 GeV

5

4

0.1

0.3

T

2.8 GeV < p < 3.6 GeV 1.1 < η < 1.4

0.05

0.25

tracks with p >1.5 GeV

T

0

0.2

7

tracks with p >1.5 GeV

5

0.15

3.6 GeV < p < 4.6 GeV

5

1.1 < η < 1.4

6

-1.4 < η < -1.1

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

MC Reconstructed (110 MIP sel. tracks) MC Truth EM cont. (2071 tracks, no MIP sel.)

tracks with p >1.5 GeV T

4.6 GeV < p < 6.0 GeV

3.5

0

0.4 r

ρ/GeV

ρ/GeV

0

1.1 < η < 1.4

9

-1.4 < η < -1.1

5 4

1.5

3

1

2

0.5

1

0

0

0.25

0.3

0.35

0.4 r

ATLAS work in progress

7

2

0.2

0.2

8 6

0.15

0.15

tracks with p >1.5 GeV

3

0.1

0.1

0.25

0.3

0.35

0.4 r

10

2.5

0.05

0.05

MC Reconstructed (112 MIP sel. tracks) MC Truth EM cont. (2171 tracks, no MIP sel.)

T

4.6 GeV < p < 6.0 GeV

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

83

10 9

ATLAS work in progress

8

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Reconstructed (818 MIP sel. tracks) MC Truth EM cont. (16657 tracks, no MIP sel.)

7 6

ATLAS work in progress

tracks with p >1.5 GeV

tracks with p >1.5 GeV

T

T

6.0 GeV < p < 10.0 GeV

7

MC Reconstructed (834 MIP sel. tracks) MC Truth EM cont. (16558 tracks, no MIP sel.)

6.0 GeV < p < 10.0 GeV

5

1.1 < η < 1.4

6

-1.4 < η < -1.1

4

5 3

4 3

2

2 1

1

14

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

1.1 < η < 1.4

0.25

0.3

0.35

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Reconstructed (155 MIP sel. tracks) MC Truth EM cont. (3574 tracks, no MIP sel.)

T

10.0 GeV < p

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.4 < η < -1.1

MC Reconstructed (136 MIP sel. tracks) MC Truth EM cont. (3529 tracks, no MIP sel.)

T

10.0 GeV < p

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

0

ρ/GeV

ρ/GeV

0

MC Reconstructed (42 MIP sel. tracks) MC Truth EM cont. (796 tracks, no MIP sel.)

0.05

0.1

0.2

0.25

0.3

0.35

0.4 r

7 6

ATLAS work in progress

tracks with p >1.5 GeV

MC Reconstructed (61 MIP sel. tracks) MC Truth EM cont. (850 tracks, no MIP sel.)

tracks with p >1.5 GeV

T

T

2.8 GeV < p < 3.6 GeV

7

0.15

2.8 GeV < p < 3.6 GeV

5

1.4 < η < 1.5

6

-1.5 < η < -1.4

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.4 < η < 1.5

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Reconstructed (122 MIP sel. tracks) MC Truth EM cont. (1851 tracks, no MIP sel.)

T

3.6 GeV < p < 4.6 GeV

9

-1.5 < η < -1.4

5 4

3

3

2

2

1

1

0

0

0.25

0.3

0.35

0.4 r

ATLAS work in progress

7

4

0.2

0.2

8 6

0.15

0.15

tracks with p >1.5 GeV

5

0.1

0.1

0.25

0.3

0.35

0.4 r

10

6

0.05

0.05

MC Reconstructed (134 MIP sel. tracks) MC Truth EM cont. (1865 tracks, no MIP sel.)

T

3.6 GeV < p < 4.6 GeV

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 14

ATLAS work in progress

12

ρ/GeV

ρ/GeV

84 MC Reconstructed (69 MIP sel. tracks) MC Truth EM cont. (961 tracks, no MIP sel.)

tracks with p >1.5 GeV T

4.6 GeV < p < 6.0 GeV

10

1.4 < η < 1.5

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.5 < η < -1.4

MC Reconstructed (77 MIP sel. tracks) MC Truth EM cont. (1007 tracks, no MIP sel.)

T

4.6 GeV < p < 6.0 GeV

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.4 < η < 1.5

ρ/GeV

10 9

0

MC Reconstructed (285 MIP sel. tracks) MC Truth EM cont. (4342 tracks, no MIP sel.)

T

6.0 GeV < p < 10.0 GeV

9

4

3

3

2

2

1

1

0

0

14

ATLAS work in progress

12

0.25

0.3

0.35

0.4 r

MC Reconstructed (82 MIP sel. tracks) MC Truth EM cont. (2256 tracks, no MIP sel.)

tracks with p >1.5 GeV T

ATLAS work in progress

-1.5 < η < -1.4

5

0.2

14

0.05

0.1

ATLAS work in progress

-1.5 < η < -1.4

6

4

4

2

2 0.2

0.25

0.3

0.35

ATLAS work in progress

0

0.4 r

ρ/GeV

ρ/GeV

0.15

7 MC Reconstructed (216 MIP sel. tracks) MC Truth EM cont. (3658 tracks, no MIP sel.)

tracks with p >1.5 GeV T

3.6 GeV < p < 4.6 GeV

5

0.2

10

6

6

0.15

tracks with p >1.5 GeV

8

0.1

0.35

0.4 r

MC Reconstructed (283 MIP sel. tracks) MC Truth EM cont. (4311 tracks, no MIP sel.)

0.25

0.3

0.35

0.4 r

MC Reconstructed (78 MIP sel. tracks) MC Truth EM cont. (2169 tracks, no MIP sel.)

T

10.0 GeV < p

1.4 < η < 1.5

0.05

0.3

T

12

8

0

0.25

6.0 GeV < p < 10.0 GeV

10.0 GeV < p

10

0.2

7

4

0.15

0.15

8 6

0.1

0.1

tracks with p >1.5 GeV

5

0.05

0.05

10

6

ρ/GeV

ρ/GeV

ρ/GeV

0

1.5 < η < 1.8

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-1.8 < η < -1.5

MC Reconstructed (248 MIP sel. tracks) MC Truth EM cont. (3688 tracks, no MIP sel.)

T

3.6 GeV < p < 4.6 GeV

6

4

5 3

4 3

2

2 1 0

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

85

5 4.5

ATLAS work in progress

4

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Reconstructed (195 MIP sel. tracks) MC Truth EM cont. (4419 tracks, no MIP sel.)

7 6

ATLAS work in progress

tracks with p >1.5 GeV

tracks with p >1.5 GeV

T

T

4.6 GeV < p < 6.0 GeV

3.5

MC Reconstructed (192 MIP sel. tracks) MC Truth EM cont. (4311 tracks, no MIP sel.)

4.6 GeV < p < 6.0 GeV

5

1.5 < η < 1.8

3

-1.8 < η < -1.5

4

2.5 3

2 1.5

2

1 1

0.5 0.05

0.1

0.15

0.2

0.25

0.3

0.35

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.5 < η < 1.8

ρ/GeV

10 9

0

0.4 r

MC Reconstructed (366 MIP sel. tracks) MC Truth EM cont. (6464 tracks, no MIP sel.)

T

6.0 GeV < p < 10.0 GeV

9

4

3

3

2

2

1

1

0

0

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

MC Reconstructed (361 MIP sel. tracks) MC Truth EM cont. (11848 tracks, no MIP sel.)

tracks with p >1.5 GeV T

ATLAS work in progress

-1.8 < η < -1.5

5

0.2

0.25

0.3

0.35

0.4 r

14

MC Reconstructed (367 MIP sel. tracks) MC Truth EM cont. (6370 tracks, no MIP sel.)

T

6.0 GeV < p < 10.0 GeV

0.05

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.8 < η < -1.5

0.25

0.3

0.35

0.4 r

MC Reconstructed (354 MIP sel. tracks) MC Truth EM cont. (11860 tracks, no MIP sel.)

T

10.0 GeV < p

7

0.2

7

4

0.15

0.15

8 6

0.1

0.1

tracks with p >1.5 GeV

5

0.05

0.05

10

6

ρ/GeV

ρ/GeV

ρ/GeV

0

10.0 GeV < p

1.5 < η < 1.8

6 8

5

6

4 3

4

2 2

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

5 4.5

ATLAS work in progress

4

0

0.4 r

ρ/GeV

ρ/GeV

0

MC Reconstructed (43 MIP sel. tracks) MC Truth EM cont. (1588 tracks, no MIP sel.)

0.05

0.1

0.2

0.25

0.3

0.35

0.4 r

7 6

ATLAS work in progress

tracks with p >1.5 GeV

MC Reconstructed (46 MIP sel. tracks) MC Truth EM cont. (1618 tracks, no MIP sel.)

tracks with p >1.5 GeV

T

T

4.6 GeV < p < 6.0 GeV

3.5

0.15

4.6 GeV < p < 6.0 GeV

5

1.8 < η < 1.9

3

-1.9 < η < -1.8

4

2.5 3

2 1.5

2

1 1

0.5 0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

C COLLECTION OF ALL PLOTS 7 6

ATLAS work in progress

ρ/GeV

ρ/GeV

86 MC Reconstructed (38 MIP sel. tracks) MC Truth EM cont. (1443 tracks, no MIP sel.)

7 6

ATLAS work in progress

tracks with p >1.5 GeV

tracks with p >1.5 GeV

T

1.8 < η < 1.9

4

3

3

2

2

1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

ρ/GeV

ATLAS work in progress

0

0.4 r

7 6

MC Reconstructed (36 MIP sel. tracks) MC Truth EM cont. (4840 tracks, no MIP sel.)

tracks with p >1.5 GeV T

0.1

0.15

0.2

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-1.9 < η < -1.8

0.25

0.3

0.35

0.4 r

MC Reconstructed (71 MIP sel. tracks) MC Truth EM cont. (4823 tracks, no MIP sel.)

T

8

3

6

2

4

1

2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

ρ/GeV

ATLAS work in progress

0

0.4 r

7 6

0.05

10.0 GeV < p

1.8 < η < 1.9

4

ρ/GeV

14

-1.9 < η < -1.8

10.0 GeV < p

5

0

6.0 GeV < p < 10.0 GeV

5

4

0

ρ/GeV

T

6.0 GeV < p < 10.0 GeV

5

MC Reconstructed (33 MIP sel. tracks) MC Truth EM cont. (1490 tracks, no MIP sel.)

MC Reconstructed (22 MIP sel. tracks) MC Truth EM cont. (1185 tracks, no MIP sel.)

tracks with p >1.5 GeV T

4.6 GeV < p < 6.0 GeV

5

1.9 < η < 2.3

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

-2.3 < η < -1.9

MC Reconstructed (34 MIP sel. tracks) MC Truth EM cont. (1231 tracks, no MIP sel.)

T

4.6 GeV < p < 6.0 GeV

6

4

5 3

4 3

2

2 1

1 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

10 9

ATLAS work in progress

8

tracks with p >1.5 GeV

7

1.9 < η < 2.3

0

ρ/GeV

ρ/GeV

0

MC Reconstructed (173 MIP sel. tracks) MC Truth EM cont. (10232 tracks, no MIP sel.)

T

6.0 GeV < p < 10.0 GeV

9

-2.3 < η < -1.9

5 4

3

3

2

2

1

1

0

0

0.25

0.3

0.35

0.4 r

ATLAS work in progress

7

4

0.2

0.2

8 6

0.15

0.15

tracks with p >1.5 GeV

5

0.1

0.1

0.25

0.3

0.35

0.4 r

10

6

0.05

0.05

MC Reconstructed (193 MIP sel. tracks) MC Truth EM cont. (10379 tracks, no MIP sel.)

T

6.0 GeV < p < 10.0 GeV

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

87

30 ATLAS work in progress 25

ρ/GeV

ρ/GeV

C COLLECTION OF ALL PLOTS MC Reconstructed (127 MIP sel. tracks) MC Truth EM cont. (23719 tracks, no MIP sel.)

tracks with p >1.5 GeV T

14

ATLAS work in progress

12

tracks with p >1.5 GeV

10

-2.3 < η < -1.9

T

10.0 GeV < p

20

MC Reconstructed (161 MIP sel. tracks) MC Truth EM cont. (24159 tracks, no MIP sel.)

10.0 GeV < p

1.9 < η < 2.3

8

15

6 10 4 5 0

2 0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4 r

88

C COLLECTION OF ALL PLOTS

E/p plots, former correction factor

0.9 0.8 0.7



C.6

0.2

ATLAS work in progress

R0.1 = 4/3

-0.6 < η < 0.0 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.8 0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 0

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

0.2

ATLAS work in progress

R0.1 = 4/3

0.0 < η < 0.6 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.2 2000

0

MC/DATA

MC/DATA

0.9

2000

4000

6000

8000

10000

12000

14000

16000

18000

2000

4000

6000

8000

10000

12000

14000

16000

18000

2000

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

p/MeV

0.9 0.8 0.7



p/MeV

0.2

ATLAS work in progress

R0.1 = 4/3

-1.1 < η < -0.6 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.8 0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 0

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

0.2

ATLAS work in progress

R0.1 = 4/3

0.6 < η < 1.1 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.2 2000

0

MC/DATA

MC/DATA

0.9

2000

4000

6000

8000

10000

12000

14000

16000

18000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

p/MeV

0.9 0.8 0.7



p/MeV

0.2

ATLAS work in progress

R0.1 = 4/3

-1.4 < η < -1.1 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.8 0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 0

4000

6000

8000

10000

12000

14000

16000

18000

20000

1 0.80

0.2

ATLAS work in progress

R0.1 = 4/3

1.1 < η < 1.4 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.2 2000

1.2

MC/DATA

MC/DATA

0.9

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

p/MeV

0

2000

4000

6000

8000

10000

12000

14000

16000

2000

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

18000

p/MeV

89

0.9 0.8 0.7



C COLLECTION OF ALL PLOTS 0.2

ATLAS work in progress

R0.1 = 4/3

-1.5 < η < -1.4 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.8 0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 0

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

0.2

ATLAS work in progress

R0.1 = 4/3

1.4 < η < 1.5 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.2 2000

0

MC/DATA

MC/DATA

0.9

2000

4000

6000

8000

10000

12000

14000

16000

18000

2000

4000

6000

8000

10000

12000

14000

16000

2000

4000

6000

8000

10000

12000

14000

16000

1 0.80

0.9

0.7

0.2

ATLAS work in progress

R0.1 = 4/3

-1.8 < η < -1.5 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.8 0.7 0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 4000

6000

8000

10000

12000

14000

16000

18000

20000

1 0.80

0.2

ATLAS work in progress

R0.1 = 4/3

1.5 < η < 1.8 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.2 2000

1.2

0

MC/DATA

MC/DATA

0.9

0.6

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

p/MeV

0.9

0.7



p/MeV

0.8

0.2

ATLAS work in progress

R0.1 = 4/3

-1.9 < η < -1.8 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.8 0.7 0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

0.2

ATLAS work in progress

R0.1 = 4/3

1.8 < η < 1.9 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.2 2000

0

MC/DATA

MC/DATA

0.9

0.6

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

p/MeV

0.9

0.7



p/MeV

0.8

0.2

ATLAS work in progress

R0.1 = 4/3

-2.3 < η < -1.9 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.8 0.7 0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

0.2

ATLAS work in progress

R0.1 = 4/3

1.9 < η < 2.3 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

0.2 2000

MC/DATA

MC/DATA

0.9

0.6

0

18000

p/MeV



p/MeV

0.8

18000

1.2

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

p/MeV

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

p/MeV

90

C COLLECTION OF ALL PLOTS

E/p plots, new correction factor

0.9 0.8 0.7



C.7

0.2

ATLAS work in progress

1.40 < R0.1 < 1.45 for Data

-0.6 < η < 0.0 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.39 <

0.2 R0.1

< 1.45 for MC

0.8 0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 0

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

0.2

ATLAS work in progress

1.41 < R0.1 < 1.43 for Data 0.2

0.0 < η < 0.6 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.38 < R0.1 < 1.43 for MC

0.2 2000

0

MC/DATA

MC/DATA

0.9

2000

4000

6000

8000

10000

12000

14000

16000

18000

2000

4000

6000

8000

10000

12000

14000

16000

18000

2000

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

p/MeV

0.9 0.8 0.7



p/MeV

0.2

ATLAS work in progress

1.45 < R0.1 < 1.48 for Data 0.2

-1.1 < η < -0.6 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.36 < R0.1 < 1.49 for MC

0.8 0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 0

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

0.2

ATLAS work in progress

1.45 < R0.1 < 1.47 for Data 0.2

0.6 < η < 1.1 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.41 < R0.1 < 1.49 for MC

0.2 2000

0

MC/DATA

MC/DATA

0.9

2000

4000

6000

8000

10000

12000

14000

16000

18000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

p/MeV

0.9 0.8 0.7



p/MeV

0.2

ATLAS work in progress

1.54 < R0.1 < 1.54 for Data

-1.4 < η < -1.1 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.54 <

0.2 R0.1

< 1.58 for MC

0.8 0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 0

4000

6000

8000

10000

12000

14000

16000

18000

20000

1 0.80

0.2

ATLAS work in progress

1.51 < R0.1 < 1.58 for Data 0.2

1.1 < η < 1.4 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.46 < R0.1 < 1.58 for MC

0.2 2000

1.2

MC/DATA

MC/DATA

0.9

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

p/MeV

0

2000

4000

6000

8000

10000

12000

14000

16000

2000

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

18000

p/MeV

91

0.9 0.8 0.7



C COLLECTION OF ALL PLOTS 0.2

ATLAS work in progress

1.58 < R0.1 < 1.60 for Data 0.2

-1.5 < η < -1.4 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.54 < R0.1 < 1.60 for MC

0.8 0.7

0.6

0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 0

4000

6000

8000

10000

12000

14000

16000

18000

1.2 1 0.80

0.2

ATLAS work in progress

1.58 < R0.1 < 1.63 for Data 0.2

1.4 < η < 1.5 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.34 < R0.1 < 1.64 for MC

0.2 2000

0

MC/DATA

MC/DATA

0.9

2000

4000

6000

8000

10000

12000

14000

16000

18000

2000

4000

6000

8000

10000

12000

14000

16000

2000

4000

6000

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10000

12000

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16000

1 0.80

0.9

0.7

0.2

ATLAS work in progress

1.61 < R0.1 < 1.62 for Data

-1.8 < η < -1.5 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.54 <

0.2 R0.1

< 1.62 for MC

0.8 0.7 0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 4000

6000

8000

10000

12000

14000

16000

18000

20000

1 0.80

0.2

ATLAS work in progress

1.49 < R0.1 < 1.63 for Data 0.2

1.5 < η < 1.8 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.39 < R0.1 < 1.63 for MC

0.2 2000

1.2

0

MC/DATA

MC/DATA

0.9

0.6

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

p/MeV

0.9

0.7



p/MeV

0.8

0.2

ATLAS work in progress

1.47 < R0.1 < 1.50 for Data 0.2

-1.9 < η < -1.8 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.44 < R0.1 < 1.50 for MC

0.8 0.7 0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

0.2

ATLAS work in progress

1.47 < R0.1 < 1.47 for Data 0.2

1.8 < η < 1.9 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.47 < R0.1 < 1.52 for MC

0.2 2000

0

MC/DATA

MC/DATA

0.9

0.6

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

p/MeV

0.9

0.7



p/MeV

0.8

0.2

ATLAS work in progress

1.56 < R0.1 < 1.56 for Data

-2.3 < η < -1.9 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.52 <

0.2 R0.1

< 1.56 for MC

0.8 0.7 0.6

0.5

0.5

0.4

0.4

0.3

0.3

0.2 4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

0.2

ATLAS work in progress

1.52 < R0.1 < 1.52 for Data 0.2

1.9 < η < 2.3 Non-diffractive Minimum Bias MC 2010 Data ( s = 7 TeV)

1.52 < R0.1 < 1.54 for MC

0.2 2000

MC/DATA

MC/DATA

0.9

0.6

0

18000

p/MeV



p/MeV

0.8

18000

1.2

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

p/MeV

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

1.2 1 0.80

p/MeV

92

C COLLECTION OF ALL PLOTS

C.8

Comparison of background estimations for both correction factors

0.1

ATLAS work in progress

0.1

0.08

bg

0.08

bg

ATLAS work in progress

0.06

0.04

0.04 -0.6 < η < 0.0 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02

0

0.06

2000

4000

6000

8000

10000

12000

0.0 < η < 0.6 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02

14000

16000

18000

0

20000

2000

4000

6000

8000

10000

12000

14000

16000

p/MeV

0.12

ATLAS work in progress

0.12

bg

bg

0.08



ATLAS work in progress

0.1

0.08

0.06

0.02

2000

4000

6000

8000

10000

12000

0.06

0.04

-1.1 < η < -0.6 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.04

0.6 < η < 1.1 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02

14000

16000

18000

0

20000

2000

4000

6000

8000

10000

12000

14000

16000

p/MeV

18000

20000

p/MeV

0.2 0.18

20000

p/MeV

0.1

0

18000

0.3

ATLAS work in progress

ATLAS work in progress 0.25

0.16 0.14

0.2

bg



bg

0.12 0.1 0.08

0.15

0.1

0.06

-1.4 < η < -1.1 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.04

1.1 < η < 1.4 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.05

0.02 0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

p/MeV

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

p/MeV

C COLLECTION OF ALL PLOTS 0.16

93

ATLAS work in progress

0.12

ATLAS work in progress

0.14 0.1

bg

0.08

0.1



bg

0.12

0.08

0.06

0.06

0.02 0

0.04

-1.5 < η < -1.4 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.04

2000

4000

6000

8000

10000

12000

1.4 < η < 1.5 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02

14000

16000

18000

0

20000

2000

4000

6000

8000

10000

12000

14000

16000

p/MeV

18000

20000

p/MeV

0.14

ATLAS work in progress

0.12

ATLAS work in progress

0.12 0.1 0.1

bg



bg

0.08

0.08

0.06

0.02

0

0.04

-1.8 < η < -1.5 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.04

2000

4000

6000

8000

10000

12000

0.06

1.5 < η < 1.8 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02

14000

16000

18000

0

20000

2000

4000

6000

8000

10000

12000

14000

16000

p/MeV

18000

20000

p/MeV

0.1 0.08

ATLAS work in progress

ATLAS work in progress

0.07 0.08

bg

0.05



bg

0.06

0.04

0.06

0.04 0.03 -1.9 < η < -1.8 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02 0.01 0

2000

4000

6000

8000

10000

12000

1.8 < η < 1.9 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02

14000

16000

18000

0

20000

2000

4000

6000

8000

10000

12000

14000

16000

p/MeV

18000

20000

p/MeV

0.16

0.14

ATLAS work in progress

0.1

ATLAS work in progress

0.12 0.08

bg



bg

0.1

0.08

0.06

0.04 -2.3 < η < -1.9 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.04

0.02

0

0.06

2000

4000

6000

8000

10000

12000

1.9 < η < 2.3 Monte Carlo background estimate with R=3/4 η Monte Carlo background estimate with R=R (p) η Data background estimate with R=R (p) Data background estimate with R=3/4

0.02

14000

16000

18000

20000

p/MeV

0

2000

4000

6000

8000

10000

12000

14000

16000

18000

20000

p/MeV