arXiv 1509.045902015-09-15hep-ph

面对轻子味破坏希格斯衰变的新物理模型

New Physics Models Facing Lepton Flavor Violating Higgs Decays

Nejc Košnik

备注：: To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22 May 2015

摘要：

我们推测最近观察到的过量的$h \to τμ$衰变的可能解释。我们推导出一个强大的下限的希格斯玻色子耦合强度的τ和μ子，即使在最普遍的新物理影响其他希格斯属性的存在。然后，我们重新评估补充间接约束来自低能量观测以及从理论上考虑。特别是，试验性信号应导致$τ\to μγ$，其速率可在Belle II观察到。反过来，我们表明，除非微调取消，效果可以容纳在模型与扩展标量部门。这些一般性的结论在明确的新物理模型中得到了证明。最后，我们将展示如何，给定的$h \to τμ$信号，当前和未来的搜索$μ\to e γ$和$μ\to e$核转换明确地约束允许的速率为$h \to τe$。

英文摘要：

We speculate about the possible interpretations of the recently observed excess in the $h \to τμ$ decay. We derive a robust lower bound on the Higgs boson coupling strength to a tau and a muon, even in presence of the most general new physics affecting other Higgs properties. Then we reevaluate complementary indirect constraints coming from low energy observables as well as from theoretical considerations. In particular, the tentative signal should lead to $τ\to μγ$ at rates which could be observed at Belle II. In turn we show that, barring fine-tuned cancellations, the effect can be accommodated within models with an extended scalar sector. These general conclusions are demonstrated in explicit new physics models. Finally we show how, given the $h \to τμ$ signal, the current and future searches for $μ\to e γ$ and $μ\to e$ nuclear conversions unambiguously constrain the allowed rates for $h \to τe$.

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英文摘要：

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