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

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List of Figures x 6.17 Muon pT scale from cosmics . . . . . . . . . . . . . . . . . . . . . . . 198 6.18 Muon pT resolution from cosmics . . . . . . . . . . . . . . . . . . . . 198 6.19 pT distribution of muons with and without smearing . . . . . . . . . . 200 7.1 Invariant mass spectrum in data after high-pT selection . . . . . . . . 210 7.2 invariant mass spectra for isolated and non-isolated muons . . . . . . 211 7.3 Template fit for QCD background estimation . . . . . . . . . . . . . . 212 7.4 Ensemble test results . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 7.5 χ 2 distributions from ensemble test . . . . . . . . . . . . . . . . . . . 215 7.6 Input vs measured QCD fraction . . . . . . . . . . . . . . . . . . . . 217 8.1 MDT hits/track after Z selection . . . . . . . . . . . . . . . . . . . . 225 8.2 RPC hits/track after Z selection . . . . . . . . . . . . . . . . . . . . . 226 8.3 TGC hits/track after Z selection . . . . . . . . . . . . . . . . . . . . 226 8.4 Pixel hits/track after Z selection . . . . . . . . . . . . . . . . . . . . 227 8.5 SCT and TRT hits/track after Z selection . . . . . . . . . . . . . . . 228 8.6 Muon kinematics after Z selection . . . . . . . . . . . . . . . . . . . . 229 8.7 Muon pT vs invariant mass . . . . . . . . . . . . . . . . . . . . . . . . 230 8.8 Track isolation and invariant mass . . . . . . . . . . . . . . . . . . . . 230 8.9 Invariant mass in various regions . . . . . . . . . . . . . . . . . . . . 231 8.10 Z pT and rapidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 8.11 Mass fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233 9.1 Cross-section measured vs predicted . . . . . . . . . . . . . . . . . . . 238 9.2 Cross-section vs CM energy . . . . . . . . . . . . . . . . . . . . . . . 239 9.3 Mass fit 3pb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240 9.4 Muon kinematics 3 pb . . . . . . . . . . . . . . . . . . . . . . . . . . 242 9.5 Muon pT vs invariant mass 3 pb . . . . . . . . . . . . . . . . . . . . . 243 9.6 Z pT and rapidity 3 pb . . . . . . . . . . . . . . . . . . . . . . . . . . 243 B.1 Muon curvature in cosmic events . . . . . . . . . . . . . . . . . . . . 249
List of Tables 1.1 Theoretical uncertainties in W/Z cross-section . . . . . . . . . . . . . 32 2.1 Design parameters of the Large Hadron Collider. . . . . . . . . . . . . 36 2.2 Beam parameters of the Large Hadron Collider . . . . . . . . . . . . 36 4.1 Integrated luminosity in run periods . . . . . . . . . . . . . . . . . . . 95 4.2 Event selection in MS hit method for muon reco efficiency . . . . . . 144 4.3 Prompt muon fractions using template fit . . . . . . . . . . . . . . . . 146 4.4 Muon reco efficiency using factorized method . . . . . . . . . . . . . . 147 4.5 Final results for MS hit method . . . . . . . . . . . . . . . . . . . . . 147 4.6 Tag-probe selection for muon reco efficiency . . . . . . . . . . . . . . 149 4.7 Final results from tag-probe method . . . . . . . . . . . . . . . . . . 151 5.1 Monte Carlo samples used in analysis . . . . . . . . . . . . . . . . . . 158 6.1 Event selection for Z candidates. . . . . . . . . . . . . . . . . . . . . . 162 6.2 Vertex weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 6.3 Selection cutflow on Z → µµ MC . . . . . . . . . . . . . . . . . . . . 176 6.4 Summary of geometrical acceptance values . . . . . . . . . . . . . . . 179 6.5 Selection cuts for trigger efficiency . . . . . . . . . . . . . . . . . . . . 180 6.6 Trigger systematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185 6.7 Final results for trigger efficiency . . . . . . . . . . . . . . . . . . . . 185 6.8 Z events in barrel and endcap . . . . . . . . . . . . . . . . . . . . . . 187 6.9 Event trigger efficiencies in barrel and endcap . . . . . . . . . . . . . 187 6.10 Trigger efficiency scale factor for Z → µµ events with errors. . . . . . 188 6.11 Reconstruction efficiency scale factor for Z → µµ events with errors. . 189 6.12 Measured scale and resolution parameters . . . . . . . . . . . . . . . 192 6.13 Result of the pT resolution fits on cosmic events . . . . . . . . . . . . 197 6.14 Selection cuts for isolation efficiency using tag-probe . . . . . . . . . . 201 6.15 Measured isolation cut efficiency . . . . . . . . . . . . . . . . . . . . . 202 6.16 Systematic uncertainties on Z → µµ acceptance . . . . . . . . . . . . 203 6.17 Total and factorized acceptances for Z events . . . . . . . . . . . . . 203 xi
Page 1: Measurement of the Z boson cross-se
Page 4 and 5: Contents Title Page . . . . . . . .
Page 6 and 7: Contents vi Electron reconstruction
Page 8 and 9: List of Figures 1.1 Proton structur
Page 12 and 13: List of Tables xii 6.18 Decompositi
Page 14 and 15: Acknowledgments xiv mate Niels van
Page 16 and 17: Chapter 1: Introduction and Theoret
Page 24: Chapter 1: Introduction and Theoret
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Chapter 3 Luminosity Measurement at
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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 7: Background Estimation 20
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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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Measurement of the Z boson cross-section in - Harvard University ...

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