Explaining the CMS Higgs flavor-violating decay excess

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Abstract

© 2014 American Physical Society. Direct searches for lepton flavor-violating Higgs boson decays in the τμ channel have recently been reported by the CMS Collaboration. The results display a slight excess of signal events with a significance of 2.5σ, which translates into a branching ratio of about 1%. By interpreting these findings as a hint for beyond the standard model physics, we show that the Type-III 2HDM is capable of reproducing such a signal while at the same time satisfying from below boundedness of the scalar potential, perturbativity, electroweak precision data, measured Higgs standard decay modes, and low-energy lepton flavor-violating constraints. We have found that the allowed signal strength ranges for the bb¯, WW∗, and ZZ∗ standard channels shrink as soon as BR(h→τμ)∼1% is enforced. Thus, we point out that if the excess persists, improved measurements of these channels may be used to test our Type-III 2HDM scenario.
Original languageEnglish
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
DOIs
Publication statusPublished - 3 Dec 2014
Externally publishedYes

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