Search for B0 decays to invisible final states (+?) at Belle

Abstract

We report searches for B0?invisible and B0?invisible+? decays, where the energy of the photon is required to be larger than 0.5 GeV. These results are obtained from a 711 fb-1 data sample that contains 772�106BB� pairs and was collected near the ?(4S) resonance with the Belle detector at the KEKB e+e- collider. We observe no significant signal for either decay and set upper limits on their branching fractions at 90% confidence level of B(B0?invisible)<7.8�10-5 and B(B0?invisible+?)<1.6�10-5. � 2020 authors.