Combined search for the quarks of a sequential fourth generation
CMS Collaboration
刊名PHYSICAL REVIEW D
2012
卷号86期号:11
关键词PP COLLISIONS ROOT-S=7 TEV FINAL-STATE HEAVY
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.86.112003
通讯作者Chatrchyan, S (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
英文摘要Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 fb(-1) recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about +/- 20 GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermions. DOI: 10.1103/PhysRevD.86.112003
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别SCI
语种英语
WOS记录号WOS:000312294500001
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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/311005/213403
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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CMS Collaboration. Combined search for the quarks of a sequential fourth generation[J]. PHYSICAL REVIEW D,2012,86(11).
APA CMS Collaboration.(2012).Combined search for the quarks of a sequential fourth generation.PHYSICAL REVIEW D,86(11).
MLA CMS Collaboration."Combined search for the quarks of a sequential fourth generation".PHYSICAL REVIEW D 86.11(2012).
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