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

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Chapter 7: Background Estimation 216 1.123 ± 0.015, which we use to correct the QCD fraction obtained from the template fit to data. Ensemble Input QCD fraction (%) Measured QCD fraction (%) 1 0 0.0002 ± 0.0005 2 0.63 0.90 ± 0.09 3 1.3 1.66 ± 0.12 4 2.0 2.46 ± 0.13 5 3.0 3.59 ± 0.15 6 4.0 4.69 ± 0.17 7 5.0 5.76 ± 0.18 8 10.0 10.5 ± 0.2 Table 7.1: Input and measured QCD fractions from 8 ensemble tests, in each of which the input fraction to the QCD pseudo-data was varied. Corrected QCD background from template fitting in 30 GeV< mµµ
Chapter 7: Background Estimation 217 Measured bb fraction (%) 10 8 6 4 2 0 0 2 4 6 8 10 Input bb fraction (%) Figure 7.6: The measured QCD fraction as a function the input fraction from 8 ensemble tests. The slope of the first-degree polynomial fit gives the correction factor for the QCD fraction obtained from a template fit to data. sections of these samples, and use it as a systematic on the Monte Carlo prediction of the QCD background. In 331 nb −1 of data, we predict 0.038±0.015(stat)±0.038(sys)±0.04(lum) events using simulated b ¯ b and c¯c samples. 7.2 Electroweak backgrounds 7.2.1 t¯t background t¯t decays can fake the signal in two ways. One W can decay into a muon, which can combine with a muon in a jet to give a Z → µµ decay topology, or both W ’s can decay into muons which, being high-pT and isolated, together resemble the signal channel. In the former case, the muon from the jet will generally be non-isolated, and
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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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