Evidence for associated production of a Higgs boson with a top quark pair in final states with electrons, muons, and hadronically decaying τ leptons at s√= 13 TeV
Evidence for associated production of a Higgs boson with a top quark pair in final states with electrons, muons, and hadronically decaying τ leptons at s√= 13 TeV
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希格斯玻色子与终态顶夸克对与电子、μ子和强子衰变轻子（s=13 TeV）相关产生的证据
DOI：
10.1007/jhep08(2018)066
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
CMS collaboration
中科院分区：
文献类型：
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作者：
CMS collaboration
本文给出了在末态顶夸克对（）与电子、μ子和强子衰变τ轻子结合产生的标准模型希格斯玻色子的研究结果。分析的数据集对应于2016年CMS实验在TeV质子-质子碰撞中记录的35.9 fb− 1的积分光度。通过使用矩阵元素和机器学习方法将信号从背景中分离出来，提高了搜索的灵敏度。测得的信号速率是标准模型中预期的产生速率的1.23+ 0.45− 0.43倍，观测（预期）显著性为3.2σ（2.8σ），这代表了在这些最终状态下产生的证据。在95%置信水平下，将信号速率的上限设定为标准模型生产速率的2.1倍。
Results of a search for the standard model Higgs boson produced in association with a top quark pair () in final states with electrons, muons, and hadronically decaying τ leptons are presented. The analyzed data set corresponds to an integrated luminosity of 35.9 fb− 1 recorded in proton-proton collisions atTeV by the CMS experiment in 2016. The sensitivity of the search is improved by using matrix element and machine learning methods to separate the signal from backgrounds. The measured signal rate amounts to 1.23+ 0.45− 0.43 times the production rate expected in the standard model, with an observed (expected) significance of 3.2σ (2.8σ), which represents evidence forproduction in those final states. An upper limit on the signal rate of 2.1 times the standard model production rate is set at 95% confidence level.