Cross section measurements of $e^+ e^-\to\omega\chi_{c0}$ form $\sqrt{s}=$ 4.178 to 4.278 GeV

Abstract

The cross section of the process $e^+ e^-\to\omega\chi_{c0}$ is measured at center-of-mass energies from $\sqrt{s}=$ 4.178 to 4.278 GeV using a data sample of 7fb$^{−1}$ collected with the BESIII detector operating at the BEPCII storage ring. The dependence of the cross section on $\sqrt{s}$ shows a resonant structure with mass of (4218.5 ± 1.6 (stat) ± 4.0 (syst)) MeV/$c^2$ and width of (28.2 ± 3.9 ( stat ) ± 1.6 (syst)) MeV, respectively. This observation confirms and improves upon the result of a previous study. The angular distribution of the $e^+ e^-\to\omega\chi_{c0}$ process is extracted for the first time.