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

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Chapter 4: Data Collection and Event Reconstruction 142 Figure 4.13: Overall efficiency of drift tubes in all MDT chambers of the middle station in barrel A (top left), barrel C (top right), endcap A (bottom left) and endcap C(bottom right). Note that the efficiency values close to zero are due to disconnected tubes or mezzanine cards being turned off.
Chapter 4: Data Collection and Event Reconstruction 143 systematic on the tube hit efficiency. Reconstruction efficiency of combined muon tracks In principle, the efficiency with which objects are reconstructed in a particular subdetector can be obtained from a Monte Carlo study. For example, the reconstruction efficiency for muons can be estimated from a simulated sample by comparing the number of generated muons to the number of reconstructed muons. However, a detector simulation will generally not be very accurate and, in particular, realistic background conditions cannot be modeled with precision. Hence, it is preferable to derive reconstruction efficiencies from real data with minimal reliance on simulation. As stated in Section 4.2.3, we use combined muons from the Staco algorithm in our analysis, so that we want to estimate the efficiency of this particular reconstruction path. We derive the efficiency using two independent approaches, both of which measure the combined muon reconstruction efficiency relative to the inner detector track reconstruction efficiency. In the MS hit method, ID tracks are tagged as muon tracks using hits in the muon spectrometer, while in the tag-probe method, ID tracks are tagged as muon tracks by identifying them as coming from Z → µµ decays. Both methods are described below. The MS hit method The selection criteria for events and for inner detector tracks used by this method are summarized in Table 4.2. The event selection criteria maximize the probability that the events are from collisions, while the kinematic and quality cuts on the tracks select well-reconstructed tracks that have similar characteristics to tracks from Z
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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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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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