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| Author | : Matthew J. Wetstein |
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| Release | : 2009 |
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| Total Pages | : 184 |
| Release | : 2009 |
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This dissertation presents a direct measurement of the W boson mass (M{sub W}) and decay width ([Lambda]{sub W}) in 1 fb−1 of W → e[nu] collider data at D0 using a novel method to model the hadronic recoil. The mass is extracted from fits to the transverse mass M{sub T}, p{sub T}(e), and E{sub T} distributions. The width is extracted from fits to the tail of the M{sub T} distribution. The electron energy measurement is simulated using a parameterized model, and the recoil is modeled using a new technique by which Z recoils are chosen from a data library to match the p{sub T} and direction of each generated W boson. We measure the the W boson mass to be M{sub W} = 80.4035 ± 0.024(stat) ± 0.039(syst) from the M{sub T}, M{sub W} = 80.4165 ± 0.027(stat) ± 0.038(syst) from the pT(e), and MW = 80.4025 ± 0.023(stat) ± 0.043(syst) from the E{sub T} distributions. [Lambda]{sub W} is measured to be [Lambda]{sub W} = 2.025 ± 0.038(stat) ± 0.061(syst) GeV.
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| Total Pages | : 26 |
| Release | : 2009 |
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We present a new method for modeling the hadronic recoil in W → l[nu] events produced at hadron colliders. The recoil is chosen from a library of recoils in Z → ll data events and overlaid on a simulated W → l[nu] event. Implementation of this method requires that the data recoil library describe the properties of the measured recoil as a function of the true, rather than the measured, transverse momentum of the boson. We address this issue using a multidimensional Bayesian unfolding technique. We estimate the statistical and systematic uncertainties from this method for the W boson mass and width measurements assuming 1 fb−1 of data from the Fermilab Tevatron. The uncertainties are found to be small and comparable to those of a more traditional parameterized recoil model. For the high precision measurements that will be possible with data from Run II of the Fermilab Tevatron and from the CERN LHC, the method presented in this paper may be advantageous, since it does not require an understanding of the measured recoil from first principles.
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| Total Pages | : 7 |
| Release | : 2009 |
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We present a direct measurement of the width of the W boson using the shape of the transverse mass distribution of W → e[nu] candidates selected in 1 fb−1 of data collected with the D0 detector at the Fermilab Tevatron collider in p{bar p} collisions at √s = 1.96 TeV. We use the same methods and data sample that were used for our recently published W boson mass measurement, except for the modeling of the recoil, which is done with a new method based on a recoil library. Our result, 2.028 ± 0.072 GeV, is in agreement with the predictions of the standard model and is the most precise direct measurement result from a single experiment to date.
| Author | : Verena Herget |
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| Release | : 2019 |
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| Author | : Arno Straessner |
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| Total Pages | : 153 |
| Release | : 2000 |
| Genre | : LEP - Elektron-Positron-Streuung - W-Boson - Paarerzeugung - L3-Detektor |
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| Author | : Sanjeev Vinodpersad Baldew |
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| Total Pages | : 0 |
| Release | : 2004 |
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| Author | : Francesco Spanò |
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| Total Pages | : 628 |
| Release | : 2004 |
| Genre | : Collisions (Physics) |
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| Author | : Sarah Alam Malik |
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| Total Pages | : 0 |
| Release | : 2010 |
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| Release | : 2001 |
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The Tevatron and LEP2 experiments presently provide the most precise direct determinations of the mass and width of the W boson. The combined results are: M[sub w]= 80.394[+-] 0.042 GeV and[Gamma][sub w]= 2.095[+-] 0.106 GeV. The results are in excellent agreement with the predictions of the Standard Model. In this article the latest results are described and the systematic errors which could limit further significant improvements in the precision of these measurements are reviewed.
