Leptoquark induced rare decay amplitudes $h \to \tau^\mp \mu^\pm$ and $\tau\to \mu\gamma$

TL;DR

This paper explores how leptoquark models could induce rare Higgs and tau decay processes, potentially explaining observed anomalies while respecting existing experimental constraints.

Contribution

It demonstrates that a 1% branching ratio for $h o au \, ext{and} \, au o \, ext{mu}$ decays is feasible within leptoquark frameworks, accounting for experimental bounds.

Findings

A 1% branching ratio for $h o au \, ext{and} \, au o \, ext{mu}$ decays is achievable.

Destructive interference allows compliance with $ au o \, ext{mu} \, ext{gamma}$ constraints.

Leptoquark models can explain potential flavor-changing signals in Higgs and tau decays.

Abstract

Rare decay modes of the newly discovered standard-model-like Higgs boson $h$ may test the flavor changing couplings in the leptoquark sector through the process $h \to \tau^\mp\mu^\pm$. Motived by the recently reported excess in LHC data from the CMS detector, we found that a predicted branching fraction Br($h \to \tau^\mp\mu^\pm$) at the level of 1\% is possible even though the coupling parameters are subjected to the stringent constraint from the null observation of $\tau\to\mu\gamma$, where the destructive cancellation among amplitudes is achievable by fine tuning.