Search for () with a hadronic tagging method at Belle

Atmacan, H.*; 谷田 聖; Belle Collaboration*; 他219名*

Physical Review D, 104(9), p.L091105_1 - L091105_9, 2021/11

https://doi.org/10.1103/PhysRevD.104.L091105

We present a search for the lepton-flavor-violating decays , where , using the full data sample of pairs recorded by the Belle detector at the KEKB asymmetric-energy collider. We use events in which one meson is fully reconstructed in a hadronic decay mode. The lepton is reconstructed indirectly using the momentum of the reconstructed and that of the from the signal decay. We find no evidence for decays and set upper limits on their branching fractions at 90% confidence level of () and ().