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Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV
CMS Collaboration
2014
发表期刊PHYSICS LETTERS B
卷号736页码:33-57
通讯作者Khachatryan, V (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
摘要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.
关键词ATLAS DETECTOR TOP-QUARK SEARCH BOSON LHC TEVATRON
学科领域Physics
DOI10.1016/j.physletb.2014.06.076
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000341487800007
引用统计
被引频次:31[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213771
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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CMS Collaboration. Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV[J]. PHYSICS LETTERS B,2014,736:33-57.
APA CMS Collaboration.(2014).Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV.PHYSICS LETTERS B,736,33-57.
MLA CMS Collaboration."Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV".PHYSICS LETTERS B 736(2014):33-57.
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