Measurement Of W Boson Polarization In Top Quark Decay In Ppbar Collisions At Sqrt S
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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.
Graduate Programs In The Physical Sciences Mathematics Agricultural Sciences The Environment And Natural Resources 2009
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Author : Peterson's
language : en
Publisher: Peterson Nelnet Company
Release Date : 2007-11
Graduate Programs In The Physical Sciences Mathematics Agricultural Sciences The Environment And Natural Resources 2009 written by Peterson's and has been published by Peterson Nelnet Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-11 with Education categories.
The six volumes of Peterson's Annual Guides to Graduate Study, the only annually updated reference work of its kind, provide wide-ranging information on the graduate and professional programs offered by accredited colleges and universities in the United States and U.S. territories and those in Canada, Mexico, Europe, and Africa that are accredited by U.S. accrediting bodies. Books 2 through 6 are divided into sections that contain one or more directories devoted to individual programs in a particular field. Book 4 contains more than 3,800 programs of study in 56 disciplines of the physical sciences, mathematics, agricultural sciences, the environment, and natural resources.
Measurement Of The Top Pair Production Cross Section And The W Boson Polarization In Top Dilepton Decay In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of The Top Pair Production Cross Section And The W Boson Polarization In Top Dilepton 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 2011 with categories.
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 The W Boson Polarisation In Top Quark Decays With The Atlas Detector
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Author : Andrea Helen Knue
language : en
Publisher:
Release Date : 2013
Measurement Of The W Boson Polarisation In Top Quark Decays With The Atlas Detector written by Andrea Helen Knue and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
A measurement of the W-boson polarisation in top-quark decays is presented. The top-antitop events were produced in proton-proton collisions at a centre-of-mass energy of sqrt{s} = 7 TeV at the LHC. The data set corresponds to an integrated luminosity of 4.7 fb-1 and was collected by the ATLAS experiment. The measurement was performed in the lepton+jets channel which is characterised by an isolated electron or muon, missing transverse energy and at least four jets. One of the jets has to be identified as a b-jet. The W-boson polarisation was studied using the angular distribution of the cha ...
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 The W Boson Helicity Fractions In The Decays Of Top Quark Pairs To Lepton Jets Final States Produced In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The W Boson Helicity Fractions In The Decays Of Top Quark Pairs To Lepton Jets Final States Produced In Pp 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 2016 with categories.
The W boson helicity fractions from top quark decays in t-tbar events are measured using data from proton-proton collisions at a centre-of-mass energy of 8 TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 inverse-femtobarns. Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F[0] = 0.681 +/- 0.012 (stat) +/- 0.023 (syst), F[L] = 0.323 +/- 0.008 (stat) +/- 0.014 (syst), and F[R] = -0.004 +/- 0.005 (stat) +/- 0.014 (syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.
Measurement Of The W Boson Polarisation In T Bar T Dilepton Events At Sqrt S
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Author : Gvantsa Mchedlidze
language : en
Publisher:
Release Date : 2018
Measurement Of The W Boson Polarisation In T Bar T Dilepton Events At Sqrt S written by Gvantsa Mchedlidze and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
A measurement of the $W$ boson polarisation in top quark decays is presented. The top anti-top pairs were produced at a centre of mass energy of $\sqrt{s}=8$ \tev \ using proton-proton collisions at the LHC. The data sample corresponds to an integrated luminosity of$\int{\mathcal{L}dt}=20.2$ fb$^{-1}$ recorded by the ATLAS detector in 2012. The measurement was performed in the dilepton channel, which is characterised by two leptons (electron or muon) with opposite electric charge, missing transverse energy from two neutrinos, and at least two jets. One of these jets is required to be tagged ...
Measurement Of W Boson Polarization In Top Quark Decay Using The Full Cdf Run Ii Data Set
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Author :
language : en
Publisher:
Release Date : 2012
Measurement Of W Boson Polarization In Top Quark Decay Using The Full Cdf Run Ii Data Set 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.
Measurement Of The W Boson Polarisation In T Bar T Dilepton Events At Sqrt S
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Author : Gvantsa Mchedlidze
language : en
Publisher:
Release Date : 2019
Measurement Of The W Boson Polarisation In T Bar T Dilepton Events At Sqrt S written by Gvantsa Mchedlidze and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
A measurement of the $W$ boson polarisation in top quark decays is presented. The top anti-top pairs were produced at a centre of mass energy of $\sqrt{s}=8$ \tev \ using proton-proton collisions at the LHC. The data sample corresponds to an integrated luminosity of$\int{\mathcal{L}dt}=20.2$ fb$^{-1}$ recorded by the ATLAS detector in 2012. The measurement was performed in the dilepton channel, which is characterised by two leptons (electron or muon) with opposite electric charge, missing transverse energy from two neutrinos, and at least two jets. One of these jets is required to be tagged...