Abstract
Based on events collected with the BESIII detector, a partial wave analysis of the decay is performed. The mass and width of the are measured to be and , respectively. The corresponding product branching fraction is . The statistical significance of the is greater than and the spin parity is determined to be for the first time. The measured mass and spin parity of the are consistent with the predictions of the lightest pseudoscalar glueball.
- Received 8 December 2023
- Revised 5 March 2024
- Accepted 28 March 2024
DOI:https://doi.org/10.1103/PhysRevLett.132.181901
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Published by the American Physical Society