Lepton flavor violating Higgs decay $h\rightarrow \mu\tau$ in the littlest Higgs Model with T-parity

TL;DR

This paper calculates the lepton flavor violating decay $h o $ within the littlest Higgs model with T-parity, showing it can reach observable levels and correlates with other rare processes, providing testable predictions for future colliders.

Contribution

It provides the first detailed calculation of $h o $ in the LHT model under current constraints, highlighting potential observability and correlations with other processes.

Findings

Branching ratio of $h o $ can reach  10^{-4}

Correlations between $h o $, $ au o  \u03b3$, and $Z o $ are identified

Predictions can be tested at future $e^+e^-$ colliders

Abstract

Inspired by the recent CMS $h \to \mu\tau$ excess, we calculate the lepton flavor violating Higgs decay $h \to \mu\tau$ in the littlest Higgs model with T-parity (LHT). Under the constraints of $\ell_i \to \ell_j \gamma$, $Z \to \ell_i \bar{\ell}_j$ and Higgs data, we find that the branching ratio of $h \to \mu\tau$ can maximally reach $\mathcal O(10^{-4})$. We also investigate the correlation between $h \to \mu\tau $, $\tau \to \mu \gamma$ and $Z \to \mu\tau$, which can be used to test LHT model at future $e^+e^-$ colliders.