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arXiv 1209.1397hep-ph
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味道破坏的希格斯衰变

Flavor Violating Higgs Decays

Roni Harnik, Joachim Kopp, Jure Zupan

摘要:

我们研究了一类新发现的125 GeV希格斯类共振的非标准相互作用,特别有趣的新物理学的探针:味道违反希格斯耦合轻子和夸克。这些相互作用可以出现在电弱尺度下的许多新物理框架中,例如两个希格斯偶极子模型,额外维度或复合模型。我们使用稀有衰变、电和磁偶极矩以及介子振荡的数据重新推导了违反希格斯耦合的味道的约束。我们证实,味道违反希格斯玻色子玻色子衰变到轻子可以是相当大的,例如,h -> τ μ和h -> τ e分支比为10%的数量级,这是低能量约束所完全允许的。我们估计目前的LHC限制h -> τ μ和h -> τ e衰变重铸现有的搜索SM希格斯在τ-τ通道,发现这些边界已经比那些罕见的τ衰变。我们还表明,这些限制可以显着改善专用搜索,我们概述了一种可能的搜索策略。因此,违反希格斯衰变的味道提供了一个发现新物理的机会,在某些情况下,这可能比从标准模型希格斯框架的味道保存偏差更容易通过实验获得。

英文摘要:

We study a class of nonstandard interactions of the newly discovered 125 GeV Higgs-like resonance that are especially interesting probes of new physics: flavor violating Higgs couplings to leptons and quarks. These interaction can arise in many frameworks of new physics at the electroweak scale such as two Higgs doublet models, extra dimensions, or models of compositeness. We rederive constraints on flavor violating Higgs couplings using data on rare decays, electric and magnetic dipole moments, and meson oscillations. We confirm that flavor violating Higgs boson decays to leptons can be sizeable with, e.g., h -> tau mu and h -> tau e branching ratios of order 10% perfectly allowed by low energy constraints. We estimate the current LHC limits on h -> tau mu and h -> tau e decays by recasting existing searches for the SM Higgs in the tau-tau channel and find that these bounds are already stronger than those from rare tau decays. We also show that these limits can be improved significantly with dedicated searches and we outline a possible search strategy. Flavor violating Higgs decays therefore present an opportunity for discovery of new physics which in some cases may be easier to access experimentally than flavor conserving deviations from the Standard Model Higgs framework.

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