Abstract
We measure the decay using data collected at the resonance with the Belle detector at the KEKB collider. The data sample used corresponds to an integrated luminosity of . We measure a branching fraction with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.
- Received 7 December 2015
DOI:https://doi.org/10.1103/PhysRevLett.116.161801
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