Higgs Flavor Violation as a Signal to Discriminate Models

Abstract

We consider the Higgs Lepton Flavor Violating process $h\to \tau \mu$, in which CMS found a $2.5\sigma$ 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 $BR(\tau \to \mu \gamma )<4.4\times 10^{-8}$. 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.

Comments: 21 pages, 7 figures; update: minor typo correction and references added, formatted for submission to JHEP