Measurement of the Z boson cross-section in - Harvard University ...

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Chapter 4 Data Collection and Event Reconstruction The electronics associated with the various detector subsystems output raw data in units of ADC (analog-to-digital converter) and TDC (time-to-digital converter) counts. Before we can perform a physics analysis on the data, it must go through an elaborate software chain which reconstructs each event. The reconstruction software attempts to identify all final-state particles in the event, including leptons, photons and quark/gluon jets. For each particle, it traces the spatial origin and gives an estimate of the four-momentum. In this chapter, we discuss the data collection and reconstruction procedure for various collision products. 4.1 Data Collection and Integrated Luminosity This thesis is based on data collected between April 11 and July 19, 2010, the corresponding run range being 152844-159224. Data collected with stable beam op- eration is used; additionally, we require that all detector components were at full operational voltage for the data to be usable. The various quality criteria are applied 94
Chapter 4: Data Collection and Event Reconstruction 95 at the luminosity block level. By filtering the luminosity blocks in each run through a Good Runs List (GRL), we ensure that only those blocks that pass the quality criteria are used in the analysis. To eliminate events from the beam halo, beam-gas interactions and cosmic particles, we subsequently select events 6.1 which came from the crossing of bunches that were known to collide in ATLAS. The integrated luminosity in the selected luminosity blocks is 331 nb −1 , with an uncertainty of 11% [94]. Figure 4.1 shows the integrated luminosity delivered and recorded vs. the day for this run duration. The duration was divided into several periods, labelled A to D6. Table 4.1 shows the run range and the integrated luminosity corresponding to each period. Note that ≈ 95% of the data was taken during period D. Period Run range Integrated luminosity (nb −1 ) A-C 152844-156682 17.60 D1 158045-158392 28.64 D2 158443-158582 31.76 D3 158632-158975 34.71 D4 158041-159086 87.82 D5 159113 28.38 D6 159179-159224 101.85 Total: 152844-159224 330.8 Table 4.1: Integrated luminosity for the runs in periods A to D corresponding to the Z Good Runs List. The total integrated luminosity for the dataset is 330.8 nb −1 . 4.2 Event Reconstruction in ATLAS Event reconstruction starts with raw data from the front-end electronics. The reconstruction procedures vary between the inner detector (ID), the calorimeters and
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Measurement of the Z boson cross-se
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Contents Title Page . . . . . . . .
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Contents vi Electron reconstruction
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List of Figures 1.1 Proton structur
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List of Figures x 6.17 Muon pT scal
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List of Tables xii 6.18 Decompositi
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Acknowledgments xiv mate Niels van
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Chapter 1: Introduction and Theoret
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Chapter 2 The Accelerator and the E
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Chapter 5: Monte Carlo Simulation 1
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Chapter 6 Event Selection After eve
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Chapter 6: Event Selection 189 Reco
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Chapter 9: Discussion and Outlook 2
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Appendix A: Event list 245 Candidat
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Appendix A: Event list 247 Candidat
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Appendix B: Comparison of muon curv
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Bibliography 251 [13] S. Ask. Statu
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Bibliography 253 [44] S. Frixione,
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Bibliography 255 [75] N. E. Adam an
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Bibliography 257 [102] The TOTEM Co
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