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

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Chapter 9: Discussion and Outlook 240 Entries/2.5 GeV 400 350 300 250 200 150 100 50 Data 2010 ( s = 7 TeV) Z → µ µ Fit ATLAS Preliminary -1 L dt = 3.37 pb 0 60 70 80 90 100 110 120 [GeV] ∫ mµ µ Figure 9.3: Unbinned fit to the Z boson mass peak using a theoretical lineshape function convolved with a Gaussian function. The Monte Carlo prediction, normalized to the total number of data events, is also shown. Carlo. Fit parameter Value from data [GeV] Value from MC [GeV] Mean 90.85 ± 0.14 91.30 ± 0.01 Width 2.83 ± 0.17 1.52 ± 0.01 Table 9.3: Mean and width of the Gaussian component of Z lineshape fits. The fit is made on unbinned data events from a 3.37 pb −1 dataset and on binned Monte Carlo. Figure 9.4 shows muon kinematic distributions (pT , η and φ) for muons from the decay of the Z bosons. Figure 9.5 shows the muon pT versus dimuon invariant mass at two different stages of the Z selection cuts: after the muon pT cut (left) and after the isolation cut (right) on the decay muons. As with the lower-statistics dataset,
Chapter 9: Discussion and Outlook 241 we see that the Z events lie in the expected band in this 2D phase space. Figure 9.6 shows the pT and rapidity distributions of the Z bosons. The Monte Carlo distributions in these figures are normalized to the number of events in data; consequently, we can only conclude that the shapes of the data distributions agree with Monte Carlo expectations.
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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 4: Data Collection and Even
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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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Chapter 6: Event Selection 165 Figu
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