Lepton Flavor Violating $\tau$ Decays in TeV Scale Type I See-Saw and Higgs Triplet Models

Abstract

The lepton flavour violating (LFV) $\tau$ decays $\tau \to (e,\mu )\gamma$ and $\tau \to 3\mu$ are investigated in the frameworks of the TeV scale type I see-saw and Higgs Triplet (or type II see-saw) models. Predictions for the rates of these processes are obtained. The implications of the existing stringent experimental upper bounds on the $\mu \to e+\gamma$ and $\mu \to 3e$ decay branching ratios for the predictions of the $\tau \to (e,\mu )\gamma$ and $\tau \to 3\mu$ decay rates are studied in detail. The possibilities to observe the indicated LFV $\tau$ decays in present and future experiments are analysed.

Comments: 22 pages, Latex, 3 figures (to be published in JHEP)