Explaining $h\to\mu^\pm\tau^\mp$, $B\to K^* \mu^+\mu^-$ and $B\to K \mu^+\mu^-/B\to K e^+e^-$ in a two-Higgs-doublet model with gauged $L_\mu-L_\tau$

TL;DR

This paper demonstrates how a two-Higgs-doublet model with gauged L_mu-L_tau symmetry can simultaneously explain observed deviations in flavor physics and Higgs decay anomalies, providing a unified theoretical framework.

Contribution

It introduces a novel model that accounts for multiple flavor and Higgs decay anomalies within a single, well-motivated theoretical structure.

Findings

The model explains h→μτ, B→K*μ+μ−, and R(K) anomalies simultaneously.

Correlations among different observables are predicted by the model.

Constraints from τ→μμμ and B_s mixing are satisfied.

Abstract

The LHC observed so far three deviations from the Standard Model (SM) predictions in flavour observables: LHCb reported anomalies in $B\to K^* \mu^+\mu^-$ and $R(K)=B\to K \mu^+\mu^-/B\to K e^+e^-$ while CMS found an excess in $h\to\mu\tau$. We show, for the first time, how these deviations from the SM can be explained within a single well-motivated model: a two-Higgs-doublet model with gauged $L_\mu-L_\tau$ symmetry. We find that, despite the constraints from $\tau\to\mu\mu\mu$ and $B_s$--$\overline{B}_s$ mixing, one can explain $h \to\mu\tau$, $B\to K^* \mu^+\mu^-$ and $R(K)$ simultaneously, obtaining interesting correlations among the observables.