Abstract
We study the process using annihilation data taken at center-of-mass energies from to 4.600 GeV with the BESIII detector at the BEPCII storage ring. The resonance is observed for the first time in the system with a significance of more than . The relative decay ratio of and is measured to be , where the first uncertainty is statistical and the second systematic (the same hereafter). The -dependent cross section of is also measured and investigated, and it can be described by a single Breit-Wigner resonance, referred to as the , with a mass of and a width of . In addition, to describe the mass distribution above , we need at least one additional Breit-Wigner resonance, labeled as , in the fit. The mass and width of the are determined. The resonant parameters of the agree with those of the in and of the in observed by the Belle and BABAR experiments within errors.
- Received 11 March 2019
- Revised 25 April 2019
DOI:https://doi.org/10.1103/PhysRevLett.122.232002
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