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Searches for lepton flavor violation in meson decays at Belle

by Sourav Patra

Submission summary

Abstract

We present the recent results on searches for charged lepton flavor violations (CLFV) using the Belle data. In the first section, we present a search for CLFV decays $B{}^0_s \rightarrow \ell^{\mp}\tau^{\pm}$, where $\ell = e, \mu$, using $121~\mathrm{fb}^{-1}$ data collected at the $\Upsilon(5S)$ resonance. We also report the results on searches for CLFV $B^+ \to K^+ \tau^\pm \ell^\mp$ decays, with~$\ell = (e, \mu)$, using $711~{\rm fb}^{-1}$ $\Upsilon(4S)$ data sample. Finally, we present a search for $\Upsilon(1S)\rightarrow\ell^\pm\ell^{\prime\mp}$ and radiative CLFV $\Upsilon(1S)\rightarrow\gamma\ell^\pm\ell^{\prime\mp}$ [$\ell,\ell^\prime = e, \mu, \tau$] decays using $25~{\rm fb}^{-1}$ data recorded at $\Upsilon(2S)$ resonance. This search uses $\Upsilon(1S)$ mesons produced in $\Upsilon(2S)\rightarrow\pi^+\pi^-\Upsilon(1S)$ transitions.