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

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Chapter 9: Discussion and Outlook 238 Figure 9.1: The measured values of the Z cross-section in the electron and muon channels as well as the combined value from the two channels. Note that the size of the dataset used for the electron channel measurement is 316 nb −1 . The theory prediction is from the FEWZ program using the MRST2008 NNLO PDF set. For the data points, the total uncertainties are shown. We conclude that the modeling of the Z boson production cross-section using QCD calculations up to order α 2 S is accurate in the limit of current measurements. 9.2 Outlook In this section, we show distributions of Z boson kinematic variables obtained with a 3.37 pb −1 dataset, which is larger than the dataset used for the cross-section measurement by a factor of ≈ 10.2. Figure 9.3 shows an unbinned fit to the dimuon invariant mass spectrum in data, using the fitting function described in Section 8.1.2. The mean and width obtained from the fit are reported in Table 9.3, together with corresponding values from Monte
Chapter 9: Discussion and Outlook 239 Figure 9.2: Combined measurements of the Z cross-section from the electron and muon channels, made at various pp and p¯p colliders. The measurements are compared with theoretical predictions at NNLO accuracy as a function of the center-of-mass energy, obtained with the FEWZ program using the MRST2008 NNLO PDF set. For the data points, the total uncertainties are shown. Note that the data points at the various energies have been staggered for better readability.
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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 5: Monte Carlo Simulation 1
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Chapter 6 Event Selection After eve
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Chapter 6: Event Selection 163 - In
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