Lepton flavor violation in Higgs boson decays
  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. 
Koji Tsumura