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Chou, P.-C.*; 谷田 聖; Belle Collaboration*; 他192名*

Physical Review D, 100(1), p.012002_1 - 012002_8, 2019/07

https://doi.org/10.1103/PhysRevD.100.012002

We report the results of a search for the decay . The analysis is performed on a data sample corresponding to an integrated luminosity of and containing pairs, collected with the Belle detector at the KEKB asymmetric-energy collider running at the resonance energy. We find no evidence for a signal and place an upper limit of at 90% confidence level.