Measurement of the ratio B(t -> Wb)/B(t -> Wq) in pp collisions at root s=8 TeV
文献类型：期刊论文
| 作者 | CMS Collaboration |
| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2014 |
| 卷号 | 736页码:33-57 |
| 关键词 | ATLAS DETECTOR TOP-QUARK SEARCH BOSON LHC TEVATRON |
| 通讯作者 | Khachatryan, V (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia. |
| 英文摘要 | 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. |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Multidisciplinary |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000341487800007 |
| 公开日期 | 2016-02-25 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/213771]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | 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. |
入库方式： OAI收割
来源：高能物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。