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

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Chapter 8: Properties of Z bosons and measurement of Z → µµ cross-section 232 Entries / 5 GeV 30 25 20 15 10 5 Data 2010 ( s=7 TeV) Z → µ µ ATLAS -1 ∫L dt = 331 nb 0 0 20 40 60 80 100 120 p Z [GeV] T Entries/0.3 45 40 35 30 25 20 15 10 5 -1 ∫L dt = 331 nb ATLAS Preliminary Data 2010 ( s=7 TeV) Z → µ µ 0 -3 -2 -1 0 1 2 3 Z Y Figure 8.10: Z boson pT and rapidity spectra after full event selection. to take into account the finite detector resolution. A similar fit is made to the binned invariant mass spectrum from Z → µµ Monte Carlo. The mean and width of the Gaussian component from each fit are reported in Table 8.3. Fit parameter Value from data [GeV] Value from MC [GeV] Mean 91.17 ± 0.56 91.30 ± 0.01 Width 4.19 ± 0.54 1.52 ± 0.01 Table 8.3: Mean and width of the Gaussian component of Z lineshape fits. The fit is made on unbinned data and binned Monte Carlo. The Gaussian width gives an estimate of the Z mass resolution due to detector effects. We see from the values in Table 8.3 that the mass resolution in data is worse than that expected from simulation by a factor of ≈2.8.
Chapter 8: Properties of Z bosons and measurement of Z → µµ cross-section 233 Entries/5 GeV 90 80 70 60 50 40 30 20 10 Data 2010 ( s = 7 TeV) Z → µ µ Fit -1 ∫L dt = 331 nb 0 60 70 80 90 100 110 120 [GeV] mµ µ Figure 8.11: Unbinned fit to the Z boson mass peak using a theoretical lineshape function convolved with a Gaussian function.
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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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Chapter 6: Event Selection 169 Entr
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Chapter 6: Event Selection 173 T p
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Chapter 6: Event Selection 175 Figu
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Chapter 6: Event Selection 177 6.2.
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