Abstract
The cross sections of at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of and , but the line shape is inconsistent with the states observed in the latter two modes. Two structures are observed in the cross sections around 4.22 and , which we call and , respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of and a width of for the , and a mass of and a width of for the , where the first uncertainties are statistical and the second ones systematic. The statistical significance of and is over one structure assumption.
- Received 22 October 2016
DOI:https://doi.org/10.1103/PhysRevLett.118.092002
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