Abstract
We report the observation of -annihilation decay and evidence for in a data sample corresponding to an integrated luminosity of collected with the BESIII detector at a center-of-mass energy . We obtain the branching fractions with a significance of and with a significance of . This measurement provides critical information to determine the nonperturbative -annihilation amplitudes and shows the potential of searching for asymmetry in .
- Received 3 November 2018
DOI:https://doi.org/10.1103/PhysRevD.99.091101
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society