Search for the lepton-flavor-violating decay B 0 ? K *0 ? � e ?
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2018
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We have searched for the lepton-flavor-violating decay B0?K?0?�e using a data sample of 711 fb-1 that contains 772�106 BB? pairs. The data were collected near the (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 B(B0?K?0?+e-)<1.2�10-7, B(B0?K?0?-e+)<1.6�10-7, and, for both decays combined, B(B0?K?0?�e)<1.8�10-7. These are the most stringent limits on these decays to date. � 2018 authors. Published by the American Physical Society.
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