Abstract
We investigate the process at center-of-mass energies from 4.189 to 4.600 GeV using of data collected by the BESIII detector at the BEPCII collider. The Born cross sections for the reactions and are measured as a function of center-of-mass energy. The energy dependence of the cross section for is shown to differ from that for in the region around the . In addition, there is evidence for a structure around 4.5 GeV in the cross section that is not present in .
- Received 4 February 2018
DOI:https://doi.org/10.1103/PhysRevD.97.071101
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Published by the American Physical Society