Abstract
Based on a sample of events collected with the BESIII detector, a study of and is performed. Evidence of the isospin-violating decay is found for the first time with a statistical significance of , the branching fraction is measured to be , and its corresponding upper limit is determined to be at 90% confidence level. A partial wave analysis of shows that the peak around invariant mass threshold favors a resonance with mass and width in agreement with the . The branching fraction of the is measured to be . The first uncertainties are statistical and the second are systematic.
- Received 1 August 2022
- Accepted 7 September 2022
- Corrected 26 October 2022
DOI:https://doi.org/10.1103/PhysRevD.106.072006
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
Physics Subject Headings (PhySH)
Corrections
26 October 2022
Correction: An error introduced during the production process in the Collaboration name has been set right.