Lepton flavor violation in Higgs boson decays

Abstract

We discuss lepton flavor violation (LFV) associated with tau leptons in the framework of the two-Higgs-doublet model. Current data for rare tau decays provide substantial upper limits on the LFV Yukawa couplings in the large $\tan \beta$ region where $\tan \beta$ is the ratio of vacuum expectation values of the two Higgs doublets. We show that measuring the LFV Higgs boson decays $h\to {\tau }^{\pm }{\mu }^{\mp }$ at future colliders can be useful to further constrain the LFV couplings especially in the relatively small $\tan \beta$ region.

Comments: 3 pages, 1 figure. Proceeding for "Summer Institute 2005", August 11-18, 2005, Fuji-Yoshida, Japan