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

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Chapter 4: Data Collection and Event Reconstruction 140 The MDT tube hit efficiency in ATLAS has been estimated using cosmic muons. Figure 4.12 shows the tube hit efficiency in one MDT chamber (BML2A03) as a function of the distance of the particle trajectory from the anode (the drift radius) [26]. Efficiency curves are shown for three different cuts on the hit residual R, requiring R < nσ, for n = 3, 5 and 10, where σ is a convolution of the tube spatial resolution and the track extrapolation error given by the extrapolator, and R is defined as: R = di − ri (4.8) where di is the distance of the reconstructed track from the anode and ri is the measured drift radius. As can be seen, even in the most conservative case (red curve), the hit efficiency is ≈94% or better over most of the drift radius. Figure 4.13 shows the distribution of tube efficiencies for the tubes in all chambers in the middle MDT station. Distributions are shown separately for the four longi- tudinal segments of the muon spectrometer: barrel A and C and endcap A and C. In each segment, the overall tube efficiency is 93-94%, as expected from studies with test beam and drift tube simulation [110]. The MDT tube hit efficiency has a systematic uncertainty, due mainly to the presence of dead tubes. To estimate the number of dead tubes, we used monitoring histograms from events accepted by the Level-1 trigger produced by the Gnam appli- cation [41]. We found 590 tubes to be consistently dead, while a further 48 tubes were dead in about half the runs used in this analysis. Comparing these results with an offline database containing a list of dead tubes, we found 339 additional tubes to be dead. Hence, 939 tubes were dead for at least part of the data we use. This is ≈ 0.3% of the total number of MDT tubes, and consequently we take this number as a
Chapter 4: Data Collection and Event Reconstruction 141 Efficiency 1 0.9 0.8 0.7 0.6 ATLAS Preliminary 2009 Cosmics Data Hardware Efficiency. Average: 99.8% 3 sigma efficiency. Average: 94.6% 5 sigma efficiency. Average: 96.3% 10 sigma efficiency. Average: 97.2% 0 2 4 6 8 10 12 14 radius (mm) Figure 4.12: Efficiency vs drift radius in the tubes in one MDT chamber. The black curve corresponds to no cut on the residual R. The blue curve corresponds to R
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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 2: The Accelerator and the
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Chapter 8: Properties of Z bosons a
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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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