Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at root s=8 TeV
CMS Collaboration
刊名PHYSICS LETTERS B
2014
卷号736页码:371-397
关键词SUPERSYMMETRIC THEORIES ATLAS DETECTOR FINAL-STATES B-JETS NATURALNESS BREAKING MODELS MASS LHC
学科分类Physics
DOI10.1016/j.physletb.2014.07.053
通讯作者Khachatryan, V (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
英文摘要A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton-proton collisions at root s = 8 TeVcollected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5 fb(-1). The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate (t) over tilde (2) decaying to a lighter top-squark mass eigenstate (t) over tilde (1) via either (t) over tilde (2) -> H (t) over tilde (1) or (t) over tilde (2) -> Z (t) over tilde (1), followed in both cases by (t) over tilde (1) -> t (chi) over tilde (0)(1), where (chi) over tilde (0)(1) is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the (t) over tilde (1) and (chi) over tilde (0)(1) states is approximately equal to the top-quark mass (m((t) over tilde )1) - m((chi) over tilde 10) similar or equal to m(t)) which is not probed by searches for direct (t) over tilde (1) squark pair production. The analysis excludes top squarks with masses m((t) over tilde2) < 575 GeVand m(<(t)over tilde>1) < 400 GeVat a 95% confidence level. (C) 2014 The Authors. Published by Elsevier B.V.
类目[WOS]Physics, Multidisciplinary
收录类别SCI
语种英语
WOS记录号WOS:000341487800057
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被引频次:54[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/311005/213773
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. Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at root s=8 TeV[J]. PHYSICS LETTERS B,2014,736:371-397.
APA CMS Collaboration.(2014).Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at root s=8 TeV.PHYSICS LETTERS B,736,371-397.
MLA CMS Collaboration."Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at root s=8 TeV".PHYSICS LETTERS B 736(2014):371-397.
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