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Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector

机译:使用ATLAS探测器搜索在多轻子最终状态下具有顶级夸克对的希格斯玻色子的相关产生

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A search for the associated production of the Higgs boson with a top quark pair is performed in multilepton final states using 20.3 fb(-1) of proton-proton collision data recorded by the ATLAS experiment at root s = 8 TeVat the Large Hadron Collider. Five final states, targeting the decays H -> WW*, tau tau, and ZZ*, are examined for the presence of the Standard Model (SM) Higgs boson: two same-charge light leptons (e or mu) without a hadronically decaying tau lepton; three light leptons; two same-charge light leptons with a hadronically decaying tau lepton; four light leptons; and one light lepton and two hadronically decaying tau leptons. No significant excess of events is observed above the background expectation. The best fit for the t (t) over barH production cross section, assuming a Higgs boson mass of 125 GeV, is 2.1(-1.2)(+1.4) times the SM expectation, and the observed (expected) upper limit at the 95% confidence level is 4.7 (2.4) times the SM rate. The p-value for compatibility with the background-only hypothesis is 1.8s; the expectation in the presence of a Standard Model signal is 0.9 sigma. (C) 2015 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V.
机译:使用ATLAS实验在大强子对撞机的根s = 8 TeV处记录的20.3 fb(-1)质子-质子碰撞数据,在多轻子最终状态下搜索具有顶夸克对的希格斯玻色子的相关产生。检查了针对衰变H-> WW *,tau tau和ZZ *的五个最终状态是否存在标准模型(SM)希格斯玻色子:两个相同电荷的轻轻子(e或mu),没有强子衰变头顿顿三个轻轻子;两个相同电荷的轻轻子,具有强子衰变的tau轻子;四个轻轻子;和一个轻质轻子和两个强子衰变的tau轻子。没有超过背景期望值的事件发生过多。假设希格斯玻色子质量为125 GeV,则在barH生产横截面上的t(t)的最佳拟合是SM期望值的2.1(-1.2)(+ 1.4)倍,并且观察到的(预期的)上限为95 %置信度是SM率的4.7(2.4)倍。与仅背景假设的兼容性的p值为1.8s;在存在标准模型信号的情况下,期望值为0.9 sigma。 (C)2015年欧洲核子研究中心(CERN),受益于ATLAS合作。由Elsevier B.V.发布

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