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arXiv 1502.07400hep-ex
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寻找希格斯玻色子玻色子的轻子味违反衰变

Search for lepton-flavour-violating decays of the Higgs boson

CMS Collaboration

摘要:

本文描述了对新近发现的希格斯玻色子(H)的轻子味破坏衰变的首次直接研究。搜索在H到mu tau[e]和H到mu tau[h]通道中进行,其中tau[e]和tau[h]分别是在电子和强子衰变通道中重建的tau轻子。在这个搜索中使用的数据样本收集在pp碰撞在一个质量中心的能量sqrt(s)= 8 TeV的CMS实验在欧洲核子研究中心的LHC和对应的积分亮度为19.7反飞秒。搜索的灵敏度是一个数量级优于现有的间接限制。观察到具有2.4标准差的显著性的略微过量的信号事件。在M[H] = 125 GeV时,这种过量的p值为0.010。最佳拟合分支分数为B(H/mu tau)=(0.84 + 0.39 - 0.37)%。设置了对分支分数的约束,在95%置信水平下B(H至μ tau)< 1.51%。这个限制随后被用来约束的mu-tau汤川耦合小于3.6E-3。

英文摘要:

The first direct search for lepton-flavour-violating decays of the recently discovered Higgs boson (H) is described. The search is performed in the H to mu tau[e] and H to mu tau[h] channels, where tau[e] and tau[h] are tau leptons reconstructed in the electronic and hadronic decay channels, respectively. The data sample used in this search was collected in pp collisions at a centre-of-mass energy of sqrt(s) = 8 TeV with the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 19.7 inverse femtobarns. The sensitivity of the search is an order of magnitude better than the existing indirect limits. A slight excess of signal events with a significance of 2.4 standard deviations is observed. The p-value of this excess at M[H] = 125 GeV is 0.010. The best fit branching fraction is B(H to mu tau) = (0.84 +0.39 -0.37)%. A constraint on the branching fraction, B(H to mu tau) < 1.51% at 95% confidence level is set. This limit is subsequently used to constrain the mu-tau Yukawa couplings to be less than 3.6E-3.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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