2023/07/24 by BESIII Collaboration, Ablikim, M., Achasov, M. N. +611
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.2307.12736
The cross sections of the e+e-→ϕη' process at center-of-mass energies from 3.508 to 4.951 GeV are measured with high precision using 26.1 fb-1 data collected with the BESIII detector operating at the BEPCII storage ring. The cross sections are of the order of a few picobarn, and decrease as the center-of-mass energy increases as s-n/2 with n=4.35± 0.14. This result is in agreement with the Nambu-Jona-Lasinio model prediction of n=3.5± 0.9. In addition, the charmless decay ψ(3770)→ϕη' is searched for by fitting the measured cross sections, yet no significant signal is observed. The upper limit of \cal B(ψ(3770)→ϕη') at the 90% confidence level is determined to be 2.3× 10-5.