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

レプトンフレーバー対称性を破る崩壊$$B^{0}to K^{ast 0} mu^{pm} e^{mp}$$の探索

Sandilya, S.*; 谷田 聖; Belle Collaboration*; 他211名*

Sandilya, S.*; Tanida, Kiyoshi; Belle Collaboration*; 211 of others*

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 fb$$^{-1}$$ that contains $$772 times 10^{6}$$ $$Bbar{B}$$ pairs. The data were collected near the $$Upsilon (4S)$$ 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 $${cal B}(B^{0}to K^{ast 0} mu^{+} e^{-}) < 1.2times 10^{-7}$$, $${cal B}(B^{0}to K^{ast 0} mu^{-} e^{+}) < 1.6times 10^{-7}$$, and, for both decays combined, $${cal B}(B^{0}to K^{ast 0} mu^{pm} e^{mp}) < 1.8times 10^{-7}$$. These are the most stringent limits on these decays to date.

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パーセンタイル:64.74

分野:Astronomy & Astrophysics

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