Search for single production of a heavy vector-like T quark decaying to a Higgs boson and a top quark with a lepton and jets in the final state
Search for single production of a heavy vector-like T quark decaying to a Higgs boson and a top quark with a lepton and jets in the final state
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DOI：
10.1016/j.physletb.2017.05.019
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发表时间：
2016-12
期刊：
影响因子：
--
通讯作者：
Cms Collaboration
中科院分区：
文献类型：
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作者：
Cms Collaboration
使用 CERN LHC CMS 实验收集的质心能量为 13 TeV 的 pp 碰撞数据，对衰变成希格斯玻色子和顶夸克的矢量状顶夸克伴侣 (T) 的单一产生进行搜索，对应于 2.3 fb 的积分光度。顶夸克衰变包括一个电子或一个μ子，而希格斯玻色子衰变成一对b夸克。没有观察到超出标准模型背景的显着过量。生产截面和支化分数乘积的排除极限是在 700 至 1800 GeV 的 T 夸克质量范围内得出的。对于 1000 GeV 的质量，假设 T 夸克分别以左手和右手耦合到标准模型粒子，则在 95% 置信水平下排除大于 0.8 和 0.7 pb 的产生截面和支化分数的乘积值。这是首次对质心能量为 13 TeV 的单独产生的类矢量 T 夸克的横截面设置排除限制的分析。
A search for single production of vector-like top quark partners (T) decaying into a Higgs boson and a top quark is performed using data from pp collisions at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 2.3 fb. The top quark decay includes an electron or a muon while the Higgs boson decays into a pair of b quarks. No significant excess over standard model backgrounds is observed. Exclusion limits on the product of the production cross section and the branching fraction are derived in the T quark mass range 700 to 1800 GeV. For a mass of 1000 GeV, values of the product of the production cross section and the branching fraction greater than 0.8 and 0.7 pb are excluded at 95% confidence level, assuming left- and right-handed coupling of the T quark to standard model particles, respectively. This is the first analysis setting exclusion limits on the cross section of singly produced vector-like T quarks at a centre-of-mass energy of 13 TeV.