Search for
arXiv:2502.07406 · doi:10.1007/JHEP05(2025)144
Abstract
Using collision data at 13 center-of-mass energies ranging from 4.600 to 4.950 GeV collected with the BESIII detector, we search for the unmeasured process . No significant signal is observed, and the upper limits of the Born cross sections at each center-of-mass energy are presented.