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

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List of Tables xii 6.18 Decomposition of CZ ........................... 206 7.1 Input and measured QCD fractions in ensemble tests . . . . . . . . . 216 7.2 Cutflow in unpaired bunch crossings . . . . . . . . . . . . . . . . . . . 221 7.3 Background summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 8.1 Z selection cutflow on the data. . . . . . . . . . . . . . . . . . . . . 224 8.2 Event summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 8.3 Mass fit parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 8.4 Cross-sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234 9.1 Theoretical cross-sections . . . . . . . . . . . . . . . . . . . . . . . . . 236 9.2 Theoretical uncertainties studied . . . . . . . . . . . . . . . . . . . . 237 9.3 Fit parameters 3 pb . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240 A.1 Z candidate list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245 A.2 Z candidate list cont’d. . . . . . . . . . . . . . . . . . . . . . . . . . 246 A.3 Z candidate list cont’d. . . . . . . . . . . . . . . . . . . . . . . . . . 247
Acknowledgments I wish to express my gratitude to the many physicists in the W/Z subgroup of the Standard Model group, and in particular of the W/Z with Muons working group, for the fast and efficient work they did which led to the submission of the cross-section measurement paper within half a year of first 7 TeV collisions. In particular, I thank the individuals who calculated the muon reconstruction and trigger efficiencies, the muon momentum scale and resolution, and the theoretical acceptance. I use their results in this thesis. My advisor Prof. John Huth has been a tower of strength and support over the years. He had time to sit down with me and talk whenever needed; I have learnt much from his insight into physics, particularly about details of QCD which is essential know-how for anyone working at a hadron collider. But more importantly, he provided necessary moral support as the LHC schedule got pushed back over and over again. This thesis would not have been written without John’s continuing encouragement. In the middle of all this, he also gave me great advice on running. I am very specially indebted to Prof. Guimaraes da Costa, who tirelessly egged me on with my analysis from the time we had first data. Without his frequent comment of ’So you think you’re done?’, I might not have been...done. Profs. Franklin and Morii have given me good advice on my work on many occasions and helped me learn how to think critically. I am grateful to them, and to George Brandenburg for his aid with the analysis for my qualifying exam. Prof. Black, while a post-doc in the Harvard group, assisted me on countless occasions with physics insights as well as code debugging. The other post-docs in the group, specifically Alberto and Corrinne, answered my physics questions and helped with technical issues at many points during the analysis. Alberto, in addition, provided essential respite by pointing me to guitar works by Jeff Loomis, whom I liked, and Paco de Lucia, whom I did not like! Not the least, I want to thank the other students in the group for their fellowship when I needed it. My collaborations with physicists outside my group have been very instructive over the years. I gained invaluable hardware experience working on muon chamber commissioning under the supervision of Prof. Zhou, Prof. Bensinger and the late Alex Marin. My first major analysis project was with Dan Levin. My former office- xiii
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Appendix A: Event list 245 Candidat
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Appendix A: Event list 247 Candidat
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Bibliography 251 [13] S. Ask. Statu
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Bibliography 257 [102] The TOTEM Co
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