Lepton flavor violating tau decays in type-III seesaw mechanism

TL;DR

This paper investigates lepton flavor violating tau decays within the type-III seesaw model, analyzing how new triplet fermions influence decay rates and comparing predictions with experimental bounds.

Contribution

It provides new constraints on model parameters and predicts tau decay branching ratios that could reach current experimental limits.

Findings

Predicted branching ratios can approach current experimental bounds.

Constraints on model parameters derived from Z-boson decay data.

Potential observability of tau LFV decays in near-future experiments.

Abstract

In this paper, the lepton flavor violating $\tau\to \ell P(V)$ ($P,V= \pi^0, \eta, \eta^{\prime}, \rho^0, \omega, \phi$) and $\tau\to 3\ell$ ($\ell = e, \mu$) decays are studied in the framework of the type-III seesaw model, in which new triplet fermions with a zero hypercharge (Y=0) interact with ordinary lepton doublets via Yukawa couplings, and affect tree-level leptonic Z-boson couplings. We investigate the experimental bound from the leptonic Z decay to get contraint on the exsiting parameters space. We predict that the upper limits on the branching ratios of $\tau\to \ell P(V)$ and $\tau\to 3\ell$ can reach the experimental current limits.