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Charged Current Cross Section Measurement at HERA
Grijpink, S.J.L.A.
Publication date
2004
Link to publication
Citation for published version (APA):
Grijpink, S. J. L. A. (2004). Charged Current Cross Section Measurement at HERA.
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Contents s
Introductionn 1 Chapterr 1 — Deep Inelastic Scattering 5
1.1.. Introduction 5 1.2.. DIS Kinematics 5 1.3.. Cross Section and Structure Functions 7
1.4.. The Quark-Parton Model 9
1.5.. Q2 Dependence: QCD Evolution 11
1.5.1.. Running Coupling Constant 12 1.5.2.. Q2 Dependence of Parton Distribution Functions 13
1.6.. Electroweak Radiative Corrections 16
1.7.. Summary 17
Chapterr 2 — ZEUS a Detector for HERA 19
2.1.. Introduction 19 2.2.. The HERA Accelerator 19
2.3.. The ZEUS Detector 22 2.3.1.. Tracking Detectors 23 2.3.2.. Calorimeters 26 2.3.3.. Muon Chambers 29 2.3.4.. C5 Counter 30 2.3.5.. Luminosity Monitor 30 2.3.6.. Trigger 31 2.4.. Data Samples 33
Chapterr 3 — Event Simulation 35
3.1.. Signal Monte Carlo 36 3.2.. Background Monte Carlo 37
3.2.1.. Neutral Current DIS 37 3.2.2.. Photoproduction 38
Contents Contents
3.2.3.. Charged Lepton Production 40 3.2.4.. Single W Production 40
Chapterr 4 — Event Reconstruction 43
4.1.. Introduction 43 4.2.. Kinematics Reconstruction 43
4.3.. Hadronic Energy 46 4.3.1.. Noise Suppression 48
4.3.2.. Clustering 51 4.3.3.. Corrections for the Hadronic Final State 52
4.4.. Interaction Vertex Measurement 57
4.5.. Summary 60
Chapterr 5 — Event Selection 63
5.1.. Trigger and Preselection 63 5.1.1.. First Level Trigger 64 5.1.2.. Second Level Trigger 65 5.1.3.. Third Level Trigger 66
5.1.4.. Preselection 67 5.2.. Event Vertex 69 5.3.. Transverse Momentum and Kinematic Region 70
5.4.. Beam-gas/pipe Background 73 5.4.1.. Beam-gas Background in the 1998-1999 Data 75
5.5.. Additional Selection Thresholds Based on Tracking 77
5.6.. Neutral Current Background 79 5.7.. Photoproduction Background 82
5.8.. Sparks 85 5.9.. Cosmic and Halo Muon Background 85
5.9.1.. MUFFIN 86 5.9.2.. Additional Muon Rejection 88
5.10.. Summary 88
Chapterr 6 — Cross Section Measurements 95
6.1.. Bin Definitions 95 6.2.. Cross Section Unfolding 100
6.3.. Background Estimation 102 6.4.. Statistical Uncertainties 102 6.5.. Systematic Uncertainties 103
Contents Contents
6.5.1.. Calorimeter Energy Scale 104 6.5.2.. QCD Cascade Model 105 6.5.3.. Selection Thresholds 106 6.5.4.. Background Subtraction 108 6.5.5.. Parton Distribution Functions I l l 6.5.6.. Effect of NLO QCD Corrections 112
6.5.7.. Energy Leakage 112 6.5.8.. Vertex Finding Efficiency 112
6.5.9.. Vertex Distribution in Monte Carlo 113 6.5.10.. Summary of the Systematic Uncertainties 114
6.6.. Summary 115
Chapterr 7 — Results 117
7.1.. Introduction 117 7.2.. Total Cross Sections 117
7.3.. Single Differential Cross Sections 117
7.4.. Reduced Cross Sections 123
7.5.. Helicity Study 123 7.6.. Conclusions 129
Appendixx A — Bin Property and Background Tables 133 Appendixx B — Figures and Tables with Uncertainties 137
B.l.. Graphical Representation of the Uncertainties 137
B.2.. Tables with Uncertainties 141
Referencess 147
