Abstract
The (, 1, 2) processes are studied at center-of-mass energies ranging from 3.773 to 4.600 GeV, using a total integrated luminosity of annihilation data accumulated with the BESIII detector at BEPCII. We observe for the first time signals at with statistical significances of and , respectively. The production cross section of at each center-of-mass energy is also measured. We find that the line shape of the cross section can be described with conventional charmonium states , , , . Compared with this, for the channel, one more additional resonance is added to describe the cross section line shape. Its mass and width are measured to be and , where the first uncertainties are statistical and the second systematic. The significance of this resonance is estimated to be , and its parameters agree with the resonance previously reported in , and the in within uncertainties. No significant signal for the process is observed, and the upper limits of Born cross sections at 90% confidence level are reported.
- Received 6 July 2021
- Accepted 13 September 2021
DOI:https://doi.org/10.1103/PhysRevD.104.092001
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