Abstract
The process is observed for the first time with the data sample of collected with the BESIII detector operating at the BEPCII collider at a center-of-mass energy . The statistical significance of the signal is and the mass is measured to be . The absolute branching fraction is measured as for the first time. The uncertainties are statistical and systematic, respectively.
- Received 23 November 2017
DOI:https://doi.org/10.1103/PhysRevD.97.051103
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Published by the American Physical Society