Higgs Flavor Violation as a Signal to Discriminate Models

We consider the Higgs Lepton Flavor Violating process $h \rightarrow τμ$, in which CMS found a $2.5 σ$ excess of events, from a model independent perspective, and find that it is difficult to generate this operator without also obtaining a sizeable Wilson coefficient for the dipole operators responsible for tau radiative decay, constrained by BABAR to ${BR}(τ\rightarrow μγ)< 4.4 \times 10^{-8}$. We then survey a set of representative models for new physics, to determine which ones are capable of evading this problem. We conclude that, should this measurement persist as a signal, type-III Two Higgs Doublet Models and Higgs portal-like models are favored, while SUSY and Composite Higgs models are unlikely to explain it.

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