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

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Chapter 7: Background Estimation 210 Entries/5 GeV 90 80 70 60 50 40 30 20 10 Data 2010 ( -1 ∫L dt = 331 nb s=7 TeV) 0 30 40 50 60 70 80 90 100 110 120 [GeV] Figure 7.1: Dimuon invariant mass distribution in data after the high-pT event selection criteria and the requirement of at least two combined muons in the event, both passing the |z0 − zvtx| cut. the dimuon invariant mass distribution has the same shape for both isolated and non- isolated muons from QCD sources, we can determine the fractions in which the two templates must be combined to reproduce the data. Multiplying the QCD fraction by the number of events in the QCD template then yields the QCD contamination in data. Fit Figure 7.2 shows the dimuon invariant mass spectra for isolated and non-isolated muons from b ¯ b and c¯c Monte Carlo. Note that, in order to obtain sufficient statistics for the invariant mass distribution of isolated muons, we loosened the pT cut on the muons to 15 GeV. We still have limited statistics for isolated muons, but the general shapes of the two distributions are close enough that the above assumption is justified. mµ µ
Chapter 7: Background Estimation 211 Arbitrary units 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 QCD MC, isolated muons QCD MC, non-isolated muons 0 20 30 40 50 60 70 80 90 100 110 120 [GeV] Figure 7.2: Dimuon invariant mass distributions for isolated and non-isolated muons in b ¯ b and c¯c events from Monte Carlo in the range 20 GeV
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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 3 Luminosity Measurement at
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Chapter 5: Monte Carlo Simulation 1
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