Search for the lepton-flavor-violating decay $B^0\to K^{\ast 0}{\mu }^{\pm }{e}^{\mp }$

Abstract

We have searched for the lepton-flavor-violating decay $B^0\to K^{\ast 0}{\mu }^{\pm }{e}^{\mp }$ using a data sample of 711 $f{b}^{-1}$ that contains $772\times 10^6$ $B\bar{B}$ pairs. The data were collected near the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. No signals were observed, and we set 90% confidence level upper limits on the branching fractions of $\mathcal{B}(B^0\to K^{\ast 0}{\mu }^{+}{e}^{-})<1.2\times 10^{-7}$, $\mathcal{B}(B^0\to K^{\ast 0}{\mu }^{-}{e}^{+})<1.6\times 10^{-7}$, and, for both decays combined, $\mathcal{B}(B^0\to K^{\ast 0}{\mu }^{\pm }{e}^{\mp })<1.8\times 10^{-7}$. These are the most stringent limits on these decays to date.

to appear in PRD(RC)

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