Abstract
We report the observation of decay based on an analysis of the inclusive photon spectrum of of collisions at the center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy collider. We measure a branching fraction of and derive an mass of , where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode.
- Received 4 July 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.232001
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Published by the American Physical Society