Lepton Flavor Violating $\tau^- \to \mu^- V^0$ Decays in the Two Higgs Doublet Model III

TL;DR

This paper investigates lepton flavor violating tau decays into muon and neutral vector mesons within the Two Higgs Doublet Model III, analyzing penguin and box diagram contributions and their experimental implications.

Contribution

It provides a detailed calculation of LFV tau decay rates in 2HDM III, highlighting the dominant neutral Higgs penguin contributions and constraining model parameters.

Findings

Neutral Higgs penguins dominate the decay contributions.

Model parameter λ_{τμ} is constrained around 10^{-3}.

Branching ratios are within experimental reach.

Abstract

In this paper, the lepton flavor violating $\tau^- \to \mu^- V^0(V^0=\rho^0,\phi,\omega)$ decays are studied in the framework of the two Higgs doublet model(2HDM) III. We present a computation of the the $\gamma-$, $Z$ penguin and box diagrams contributions, and make an analysis of their impacts. Our results show that, among the $\gamma-$ penguins, the penguins with neutral Higgs in the loop are very larger than those with charged Higgs in the loop. We find that the model parameter $\lambda_{\tau\mu}$ is tightly constrained at the order of $O(10^{-3})$ and the branching ratios of these decays are available at the experiment measure. With the high luminosity, the B factories have considerable capability to find these LFV processes. On the other hand, these processes can also provide some valuable information to future research and furthermore present the reliable evidence to test the 2HDM III model.