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

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Chapter 6: Event Selection 198 scale T P 0.3 + µ- 0.25 µ 0.2 0.15 0.1 0.05 0 -0.05 -0.1 10 P MS T 2 10 [GeV/c] Figure 6.17: pT scale, as a function of the muon pT measured in the MS, for positive muons (red) and negative muons (blue). resolution T P 0.1 0.08 0.06 0.04 0.02 0 10 P MS T [GeV/c] 2 10 resolution T P 10 P MS T 3 10 [GeV/c] Figure 6.18: Fits to the pT resolution distributions, as a function of the muon pT measured in the MS. Left: positive muons (fit probability: 89.7%); right: negative muons (fit probability: 41.6%). 0.1 0.08 0.06 0.04 0.02 0 2 10
Chapter 6: Event Selection 199 the effect of misalignment on track curvature. Effect of momentum scale and resolution on Z → µµ acceptance From the values given in Table 6.12, we take the uncertainty in the muon momentum scale as 1%. To estimate its effect on the Z event acceptance, we change the curvature of muons in our Z → µµ Monte Carlo sample up and down by this amount. The change in acceptance from the central value is seen to be +0.34% and -0.45% respectively in the two cases. We conservatively take the larger of the two values as the systematic uncertainty on CZ from this source. Since the smearing needed in the barrel and in the endcap differ by a factor of ≈ 2, we estimate its effect on the acceptance separately in the two regions. To be conservative, we take as the central value the smearing correction plus the 1 σ error, i.e. , 5% in the barrel and 9% in the endcap (Table 6.12). We smear the muon curvature by these amounts and recalculate the Z acceptance. The change in acceptance from the central value is found to be 0.48%, which we take to be the systematic error from pT resolution. By adding the two contributions in quadrature, we find the combined systematic uncertainty from muon momentum scale and resolution to be 0.66%. The pT spectrum of Z decay muons in Monte Carlo is shown in Figure 6.19 with and without the additional smearing.
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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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Appendix B: Comparison of muon curv
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Bibliography 251 [13] S. Ask. Statu
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Bibliography 253 [44] S. Frixione,
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Bibliography 255 [75] N. E. Adam an
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Bibliography 257 [102] The TOTEM Co
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