Theory Seminar DATE: 2006-02-28 11:00 - PLACE: Kenkyu Honkan 2F RM 220 TITLE: Lepton Flavor Violating rare B/tau decay and leptogenesis in low scale seesaw model CONTACT: Tango SPEAKER: Prof. T. Morozumi  (Hiroshima Univ.) LANGUAGE: English ABSTRACT: We study lepton flavor number violating rare　B/tau decays, $ b \to s l_h^{\pm} l_l^{\mp}$, in a seesaw model with low scale singlet Majorana neutrinos motivated by the resonant leptogenesis scenario. The branching ratios of inclusive decays $ b \to s l_h^{\pm} \bar{l_l}^{\mp} $ with two almost degenerate singlet neutrinos at TeV scale are investigated in detail. We find that there exists a class of seesaw model in which the branching fractions of $ b \to s \tau \mu $ and $\tau \to \mu \gamma$ can be as large as $10^{-10}$ and $10^{-9}$ within the reach of Super B factories, respectively, without being in conflict with neutrino mixings and mass squared difference of neutrinos from neutrino data, invisible decay width of $Z$ and the present limit of $Br(\mu \to e \gamma)$. Back