Measurement Of The Ratio B T To Wb B T To Wq In Pp Collisions At Sqrt S
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Measurement Of The Ratio B T To Wb B T To Wq In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of The Ratio B T To Wb B T To Wq 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 2014 with categories.
The ratio of the top-quark branching fractions R=B(t to Wb)/B(t to Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the t t-bar dilepton final state with proton-proton collision data at sqrt(s)=8 TeV from an integrated luminosity of 19.7 inverse femtobarns, collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. By counting the number of b jets per event, an unconstrained value of R=1.014 +/- 0.003 (stat.) +/- 0.032 (syst.) is measured, in good agreement with the standard model prediction. A lower limit R> 0.955 at the 95% confidence level is obtained after requiring R ;=1, and a lower limit on the Cabibbo-Kobayashi-Maskawa matrix element abs(V[tb]) 0.975 is set at 95% confidence level. The result is combined with a previous CMS measurement of the t-channel single-top-quark cross section to determine the top-quark total decay width, Gamma[t]=1.36 +/- 0.02 (stat.) +0.14/-0.11 (syst.) GeV.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1988
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Physics categories.
Measurement Of The Ratio Mathcal B Mathrm B 0 S To Mathrm J Psi Mathrm F 0 980 Mathcal B Mathrm B 0 S To Mathrm J Psi Phi 1020 In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of The Ratio Mathcal B Mathrm B 0 S To Mathrm J Psi Mathrm F 0 980 Mathcal B Mathrm B 0 S To Mathrm J Psi Phi 1020 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 2015 with categories.
The ratio $R_{\, \mathrm{f}_0 / \phi}$ of the branching fractions of the $\mathrm{B}^0_{s}$ meson to the CP-odd eigenstate $\mathrm{J}/\psi\, \mathrm{f}_0(980)$ and to $\mathrm{J}/\psi\, \phi(1020)$ is measured, where $\mathrm{J}/\psi \to \mu^+\mu^-$, $\mathrm{f}_0 \to \pi^+\pi^-$, and $\phi \to \mathrm{K}^+\mathrm{K}^-$. The analysis is based on a data sample of pp collisions at a centre-of-mass energy of 7 TeV, collected by the CMS experiment, corresponding to an integrated luminosity of 5.3 fb$^{-1}$. The result is $R_{\, \mathrm{f}_0 / \phi} = 0.140 \pm 0.013 \pm 0.018$, where the first uncertainty is statistical and the second is systematic. This result is consistent with theoretical predictions and previous measurements of $R_{\, \mathrm{f}_0 / \phi}$. It is the most precise measurement of the ratio to date.
Measurement Of Prompt Psi 2s To J Psi Yield Ratios In Pbpb And Pp Collisions At Sqrt S Nn
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language : en
Publisher:
Release Date : 2014
Measurement Of Prompt Psi 2s To J Psi Yield Ratios In Pbpb And Pp Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The ratio between the prompt psi(2S) and J/psi yields, reconstructed via their decays into muon pairs, is measured in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC, corresponding to integrated luminosities of 150 inverse microbarns and 5.4 inverse picobarns, respectively. The double ratio of measured yields, (N[psi(2S)]/N[J/psi])[PbPb] / (N[psi(2S)]/ N[J/psi])[pp], is computed in three PbPb collision centrality bins and two kinematic ranges: one at midrapidity, abs(y)
Measurement Of The Ratio Mathcal B Mathrm B 0 S To Mathrm J Psi Mathrm F 0 980 Mathcal B Mathrm B 0 S To Mathrm J Psi Phi 1020 In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Ratio Mathcal B Mathrm B 0 S To Mathrm J Psi Mathrm F 0 980 Mathcal B Mathrm B 0 S To Mathrm J Psi Phi 1020 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 ratio Rf0/? of the branching fractions of the B0 s meson to the CP-odd eigenstate J/? f0(980) and to J/? ?(1020) is measured, where J/? → æ +æ -, f0 → ? +? -, and ? → K+K-. The analysis is based on a data sample of pp collisions at a centre-of-mass energy of 7 TeV, collected by the CMS experiment, corresponding to an integrated luminosity of 5.3 fb-1 . The result is Rf0/? = 0.140 ± 0.013 ± 0.018, where the first uncertainty is statistical and the second is systematic. This result is consistent with theoretical predictions and previous measurements of Rf0/?. It is the most precise measurement of the ratio to date.
Measurement Of Associated W Charm Production In Pp Collisions At Sqrt S
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Author :
language : en
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Release Date : 2013
Measurement Of Associated W Charm Production 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 2013 with categories.
Measurement Of The Charge Of Asymmetry Of W Bosons Produced In Pp Collisions At Sqrt S
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Author : Verena Ingrid Martinez Outschoorn
language : en
Publisher:
Release Date : 2011
Measurement Of The Charge Of Asymmetry Of W Bosons Produced In Pp Collisions At Sqrt S written by Verena Ingrid Martinez Outschoorn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Collisions (Nuclear physics) categories.
A Measurement Of W Boson Pair Production In Pp Collisions At Sqrt S
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Author : Philip Sommer
language : en
Publisher:
Release Date : 2016
A Measurement Of W Boson Pair Production In Pp Collisions At Sqrt S written by Philip Sommer 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.
Zusammenfassung: In this thesis, measurements of the W boson pair production cross section in proton-proton collisions at a centre-of-mass energy of 8 TeV are presented. A dataset corresponding to an integrated luminosity of 22.3 /fb recorded by the ATLAS experiment in the year 2012 is used. The W bosons are identified by their decay products of exactly two leptons with opposite electrical charge, electrons or muons, and missing transverse momentum induced by their corresponding neutrinos. First, a measurement restricted to final states without hadronic jets is presented and differential fiducial cross sections, total cross sections and limits on anomalous triple gauge boson couplings are obtained. A second measurement of the fiducial cross section in association with exactly one hadronic jet is presented. The ratio of fiducial cross sections for different jet multiplicities is reported and the combined fiducial cross section is extrapolated to the total phase space.
Measurement Of The Production Cross Section For A W Boson And Two B Jets In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of The Production Cross Section For A W Boson And Two B Jets 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 2014 with categories.
J Psi And Psi 2s Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
J Psi And Psi 2s Production 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 2012 with categories.
A measurement of the J/psi and psi(2S) production cross sections in pp collisions at sqrt(s)=7 TeV with the CMS experiment at the LHC is presented. The data sample corresponds to an integrated luminosity of 37 inverse picobarns. Using a fit to the invariant mass and decay length distributions, production cross sections have been measured separately for prompt and non-prompt charmonium states, as a function of the meson transverse momentum in several rapidity ranges. In addition, cross sections restricted to the acceptance of the CMS detector are given, which are not affected by the polarization of the charmonium states. The ratio of the differential production cross sections of the two states, where systematic uncertainties largely cancel, is also determined. The branching fraction of the inclusive B to psi(2S) X decay is extracted from the ratio of the non-prompt cross sections to be: BR(B to psi(2S) X) = (3.08 +/- 0.12(stat.+syst.) +/- 0.13(theor.) +/- 0.42(BR[PDG])) 10-̂3.