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 230 [GeV] T p 100 90 80 70 60 50 40 30 20 ATLAS Preliminary Data 2010( s = 7 TeV) Z → µ µ Backgrounds -1 ∫L dt = 331 nb 0 20 40 60 80 100 120 mµ µ [GeV] [GeV] T p 100 90 80 70 60 50 40 30 20 ATLAS Preliminary ∫ Data 2010( s = 7 TeV) Z → µ µ Backgrounds -1 L dt = 331 nb 0 20 40 60 80 100 120 mµ µ [GeV] Figure 8.7: Muon pT versus dimuon invariant mass for signal Monte Carlo, background Monte Carlo and data: after the muon pT cut (left) and after the isolation cut (right). T p µ / p T ∑ 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Data 2010( s = 7 TeV) Z → µ µ Backgrounds -1 L dt = 331 nb 0 20 30 40 50 60 70 80 90 100 µ p ∫ [GeV] T Entries / 5 GeV 80 70 60 50 40 30 20 10 Data 2010 ( s=7 TeV) Z → µ µ ATLAS -1 ∫L dt = 331 nb 0 60 70 80 90 100 110 120 mµ µ [GeV] Figure 8.8: Track isolation ratio versus muon pT (left) and the dimuon invariant mass spectrum (right) after the Z selection cuts. The track isolation ratio is defined as the sum of the pT of all inner detector tracks in a cone of size ∆R
Chapter 8: Properties of Z bosons and measurement of Z → µµ cross-section 231 Figure 8.9: Dimuon invariant mass spectrum after the Z selection cuts for three cases: both decay muons in the barrel (topleft), both in the endcap (topright), and one muon each in the barrel and the endcap (bottom).
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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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Chapter 6 Event Selection After eve
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Chapter 6: Event Selection 163 - In
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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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