2025/03/08 by Zhang, Xiao-Yu, Shi, Pan-Pan, Guo, Feng-Kun
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2503.06259
The absence of observed charmonium-like states with the exotic quantum numbers JPC=1-+ has prompted us to investigate the production rates of the 1-+ D D1(2420) and D^* D1(2420) hadronic molecules, which we refer to as ηc1 and ηc1′, respectively, in electron-positron collisions. Assuming a hadronic molecular nature for the vector charmonium-like states ψ(4360) and ψ(4415), we evaluate the radiative decay widths of ψ(4360)→γηc1 and ψ(4415)→γηc1′. Using these decay widths, we estimate the cross sections for producing ηc1 and ηc1′ in electron-positron annihilations, as well as the event numbers at the planned Super τ-Charm Facility. Our results suggest that the ideal energy region for observing these states is around 4.44 and 4.50 GeV, just above the D^* D1(2420) and D^* D2^*(2460) thresholds, respectively.