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

## TL;DR

This paper measures the energy-dependent cross section of the process $e^+e^-
ightarrow ext{omega} ext{chi}_{c0}$ between 4.178 and 4.278 GeV, revealing a resonant structure and providing new angular distribution data.

## Contribution

It presents the first measurement of the angular distribution and confirms a resonant structure in the cross section with improved precision.

## Key findings

- Resonant structure with mass ~4218.5 MeV/c^2 and width ~28.2 MeV.
- First extraction of the angular distribution for this process.
- Improved accuracy over previous measurements.

## Abstract

The cross section of the process $e^+e^- \rightarrow \omega \chi_{c0}$ is measured at center-of-mass energies from $\sqrt{s} =$ 4.178 to 4.278 GeV using a data sample of 7 fb$^{-1}$ 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 $(4218.5\pm1.6(\text{stat.})\pm4.0(\text{syst.}))$ MeV/$c^2$ and width of $(28.2\pm3.9(\text{stat.})\pm1.6(\text{syst.}))$ MeV, respectively. This observation confirms and improves upon the result of a previous study. The angular distribution of the $e^+e^- \rightarrow \omega \chi_{c0}$ process is extracted for the first time.