Lepton flavor violating decay of SM-like Higgs in a radiative neutrino mass model

TL;DR

This paper investigates lepton flavor violating decays of the Higgs boson within a radiative neutrino mass model, showing potential branching ratios up to 10^{-4} driven by charged Higgs interactions, with implications for experimental detection.

Contribution

It provides a detailed analysis of LFV Higgs decay rates in a specific neutrino mass model, highlighting the dominant charged Higgs contributions and possible observable branching ratios.

Findings

BR of LFVHD can reach 10^{-5} to 10^{-4} depending on parameters.

Dominant contributions from singly charged Higgs and exotic neutrinos.

Large Br(h→μτ) correlates with very small Br(h→eτ).

Abstract

The lepton flavor violating decay of the Standard Model-like Higgs (LFVHD) is discussed in the framework of the radiative neutrino mass model built in \cite{Kenji}. The branching ratio (BR) of the LFVHD are shown to reach $10^{-5}$ in the most interesting region of the parameter space shown in \cite{Kenji}. The dominant contributions come from the singly charged Higgs mediations, namely the coupling of $h^\pm_2$ with exotic neutrinos. Furthermore, if doubly charged Higgs is heavy enough to allow the mass of $h^\pm_2$ around 1 TeV, the mentioned BR can reach $10^{-4}$. Besides, we have obtained that the large values of the Br$(h\rightarrow\mu\tau)$ leads to very small ones of the Br$(h\rightarrow e\tau)$, much smaller than various sensitivity of current experiments.