Abstract
Based on a sample of events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay is performed. An isoscalar state with exotic quantum numbers , denoted as , has been observed for the first time with statistical significance larger than . Its mass and width are measured to be and , respectively. The first uncertainties are statistical and the second are systematic. The product branching fraction is measured to be . In addition, an upper limit on the ratio of branching fractions is determined to be at 90% confidence level, which lends support to the hypothesis that the has a large glueball component.
- Received 3 February 2022
- Accepted 3 October 2022
DOI:https://doi.org/10.1103/PhysRevD.106.072012
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