W Boson Polarization Measurement In The T Bar T Dilepton Channel Using The Cdf Ii Detector

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W Boson Polarization Measurement In The T Bar T Dilepton Channel Using The Cdf Ii Detector

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Author :
language : en
Publisher:
Release Date : 2012

W Boson Polarization Measurement In The T Bar T Dilepton Channel Using The Cdf Ii Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.

We present a measurement of W boson polarization in top-quark decays in t{bar t} events with decays to dilepton final states using 5.1 fb−1 integrated luminosity in p{bar p} collisions collected by the CDF II detector at the Tevatron. A simultaneous measurement of the fractions of longitudinal (f0) and right-handed (f+) W bosons yields the results f0 = 0.71{sub -0.17}{sup +0.18}(stat) ± 0.06(syst) and f+ = -0.07 ± 0.09(stat) ± 0.03(syst). Combining this measurement with our previous result based on single lepton final states, we obtain f0 = 0.84 ± 0.09(stat) ± 0.05(syst) and f+ = -0.16 ± 0.05(stat) ± 0.04(syst). The results are consistent with standard model expectation.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1994

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.

Energy Research Abstracts

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Author :
language : en
Publisher:
Release Date : 1995

Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Power resources categories.

Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

High Energy Physics Index

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Author :
language : en
Publisher:
Release Date : 1993

High Energy Physics Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Particles (Nuclear physics) categories.

Government Reports Announcements Index

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Author :
language : en
Publisher:
Release Date : 1996-02

Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-02 with Science categories.

Government Reports Annual Index

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Author :
language : en
Publisher:
Release Date : 1993

Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Government reports announcements & index categories.

Measurement Of W Boson Polarization In Top Quark Decay

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Author :
language : en
Publisher:
Release Date : 2005

Measurement Of W Boson Polarization In Top Quark Decay written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

A measurement of the polarization of the W boson from top quark decay is an excellent test of the V-A form of the charged-current weak interaction in the standard model. Since the longitudinal W boson is intimately related to the electroweak symmetry breaking mechanism, and the standard model gives a specific prediction for the fraction of longitudinal W bosons from top decays, it is of particular interest for study. This thesis presents a measurement of W boson polarization in top quark decay through an analysis of the cos [theta]* distribution in the lepton-plus-jets channel of t[bar t] candidate events from p[bar p] collisions at [radical]s = 1.96 TeV. This measurement uses an integrated luminosity of [approx]162 pb[sup -1] of data collected with the CDF Run II detector, resulting in 31 t[bar t] candidate events with at least one identified b jet. Using a binned likelihood fit to the cos [theta]* distribution from the t[bar t] candidate events found in this sample, the fraction of W bosons with longitudinal polarization is determined to be F[sub 0] = 0.99[sub -0.35][sup +0.29](stat.) [+-] 0.19(syst.), F[sub 0]> 0.33 [at] 95% CL. This result is consistent with the standard model prediction, given a top quark mass of 174.3 GeV/c[sup 2], of F[sub 0] = 0.701 [+-] 0.012.

Measurement Of W Boson Polarization In Top Quark Decay

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Author : Trevor Neil Vickey
language : en
Publisher:
Release Date : 2004

Measurement Of W Boson Polarization In Top Quark Decay written by Trevor Neil Vickey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Measurement Of W Boson Polarization In Top Quark Decay In Ppbar Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2010

Measurement Of W Boson Polarization In Top Quark Decay In Ppbar Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.

We report measurements of the polarization of W bosons from top-quark decays using 2.7 fb−1 of p{bar p} collisions collected by the CDF II detector. Assuming a top-quark mass of 175 GeV/c2, three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f0) and right-handed (f+) W bosons yields the model-independent results f0 = 0.88 ± 0.11(stat) ± 0.06(syst) and f+ = -0.15 ± 0.07(stat) ± 0.06(syst) with a correlation coefficient of -0.59. A measurement of f0 (f+) constraining f+ (f0) to its standard model value of 0.0 (0.7) yields f0 = 0.70 ± 0.07(stat) ± 0.04(syst) (f+ = 0.01 ± 0.02(stat) ± 0.05(syst)). All these results are consistent with standard model expectations.

Measurement Of The W Boson Polarization In Top Decay At Cdf At S 1 2

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Author :
language : en
Publisher:
Release Date : 2004

Measurement Of The W Boson Polarization In Top Decay At Cdf At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

The polarization of the W boson in t 2!Wb decay is unambiguously predicted by the Standard Model of electroweak interactions and is a powerful test of our understanding of the tbW vertex. We measure this polarization from the invariant mass of the b quark from t 2!Wb and the lepton from W 2!l[nu] whose momenta measure the W decay angle and direction of motion, respectively. In this paper we present a measurement of the decay rate (f{sub V + A}) of the W produced from the decay of the top quark in the hypothesis of V + A structure of the tWb vertex. We find no evidence for the non-standard V + A vertex and set a limit on f{sub V + A}