Abstract
Using events acquired with the BESIII detector at the BEPCII storage rings, the decay is observed for the first time with a significance of via the process . We measure the branching fraction of to be , where the first and second uncertainties are statistical and systematic, respectively.
- Received 8 December 2020
- Accepted 22 March 2021
DOI:https://doi.org/10.1103/PhysRevD.103.072006
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