Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector
Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector
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DOI：
10.1007/jhep04(2015)117
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发表时间：
2015-04-21
影响因子：
5.4
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
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作者：
Aad, G.;Abbott, B.;Zwalinski, L.
根据大型强子对撞机上的ATLAS实验在2011-2012年间记录的全套质子-质子碰撞数据，给出了H>；tau衰变的搜索结果。这些数据分别对应于根S=7TeV和根S=8TeV质心能量下4.5FB(-1)和20.3FB(-1)的积分光度。我们考虑了轻子(tau->；L nu(Nu)，L=e，u)和强子(tau->；强子nu)tau衰变的所有组合。发现来自其他标准模型过程的超出预期背景的事件具有4.5(3.4)个标准偏差的观测(预期)显著性。这一过剩为最近发现的希格斯玻色子与费米子的直接耦合提供了证据。测量到的信号强度，归一化到标准模型预期，u=1.43(-0.37)(+0.43)，与标准模型中预测的汤川耦合强度一致。
Results of a search for H -> tau tau decays are presented, based on the full set of proton-proton collision data recorded by the ATLAS experiment at the LHC during 2011 and 2012. The data correspond to integrated luminosities of 4.5 fb(-1) and 20.3 fb(-1) at centre-of-mass energies of root s = 7TeV and root s = 8 TeV respectively. All combinations of leptonic (tau -> l nu(nu) over bar with l = e, mu) and hadronic (tau -> hadrons nu) tau decays are considered. An excess of events over the expected background from other Standard Model processes is found with an observed (expected) significance of 4.5 (3.4) standard deviations. This excess provides evidence for the direct coupling of the recently discovered Higgs boson to fermions. The measured signal strength, normalised to the Standard Model expectation, of mu = 1.43(-0.37)(+0.43) is consistent with the predicted Yukawa coupling strength in the Standard Model.