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Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at root s=8 TeV
CMS Collaboration
2014
发表期刊EUROPEAN PHYSICAL JOURNAL C
卷号74期号:9
通讯作者Khachatryan, V (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
摘要A measurement of the cross section for the production of top quark-antiquark pairs (t (t) over bar) in association with a vector boson V (W or Z) in proton-proton collisions at root s = 8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb(-1) recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and mu) channels: a same-sign dilepton analysis targeting t (t) over barW events, and trilepton and four-lepton analyses designed for t (t) over barZ events. In the same-sign dilepton channel, the t (t) over barW cross section is measured as sigma(t (t) over barW) = 170(-80)(+90) (stat) +/- 70 (syst) fb, corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the t (t) over barZ cross section, sigma(t (t) over barZ) = 200(-70)(+80) (stat)(-30)(+40) (syst)fb(-1), is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive t (t) over barV process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.
关键词PARTON DISTRIBUTIONS LHC COLLIDER
学科领域Physics
DOI10.1140/epjc/s10052-014-3060-7
收录类别SCI
语种英语
WOS类目Physics, Particles & Fields
WOS记录号WOS:000350142400001
引用统计
被引频次:16[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/311005/213860
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 top quark-antiquark pair production in association with a W or Z boson in pp collisions at root s=8 TeV[J]. EUROPEAN PHYSICAL JOURNAL C,2014,74(9).
APA CMS Collaboration.(2014).Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at root s=8 TeV.EUROPEAN PHYSICAL JOURNAL C,74(9).
MLA CMS Collaboration."Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at root s=8 TeV".EUROPEAN PHYSICAL JOURNAL C 74.9(2014).
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