About: Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV     Goto   Sponge   NotDistinct   Permalink

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Description
  • The ratio of the top-quark branching fractions R = B(t --> Wb)/B(t --> Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the t (t) over bar dilepton final state with proton-proton collision data at root s = 8 TeV from an integrated luminosity of 19.7 fb(-1), 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 a good agreement with current precision measurements in electroweak and flavour sectors. 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 |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.)(-0.11)(+0.14) (syst.) GeV. (C) 2014 The Authors. Published by Elsevier B.V.
  • The ratio of the top-quark branching fractions R = B(t --> Wb)/B(t --> Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the t (t) over bar dilepton final state with proton-proton collision data at root s = 8 TeV from an integrated luminosity of 19.7 fb(-1), 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 a good agreement with current precision measurements in electroweak and flavour sectors. 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 |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.)(-0.11)(+0.14) (syst.) GeV. (C) 2014 The Authors. Published by Elsevier B.V. (en)
Title
  • Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV
  • Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV (en)
skos:prefLabel
  • Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV
  • Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV (en)
skos:notation
  • RIV/00216208:11320/14:10284781!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(LG13031)
http://linked.open...iv/cisloPeriodika
  • September
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
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  • 27908
http://linked.open...ai/riv/idVysledku
  • RIV/00216208:11320/14:10284781
http://linked.open...riv/jazykVysledku
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  • hadron physics; root s=8 TeV; pp collisions; CMS (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • NL - Nizozemsko
http://linked.open...ontrolniKodProRIV
  • [C6858F8DC6E6]
http://linked.open...i/riv/nazevZdroje
  • Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
http://linked.open...in/vavai/riv/obor
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http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 736
http://linked.open...iv/tvurceVysledku
  • Adam, W.
  • Finger, Michael
  • Finger, Miroslav
  • Khachatryan, V.
  • Bodlák, Martin
  • Bergauer, T.
  • Dragicevic, M.
  • Eroe, J.
  • Fabjan, C.
  • Friedl, M.
  • Ghete, V. M.
  • Hoermann, N.
  • Sirunyan, A. M.
  • Tumasyan, A.
  • Hartl, C.
  • Fruewirth, R.
http://linked.open...ain/vavai/riv/wos
  • 000341487800007
issn
  • 0370-2693
number of pages
http://bibframe.org/vocab/doi
  • 10.1016/j.physletb.2014.06.076
http://localhost/t...ganizacniJednotka
  • 11320
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