Study of $e^+e^-\rightarrow\Omega^{-}\bar\Omega^{+}$ at center-of-mass energies from 3.49 to 3.67 GeV

TL;DR

This study measures the production of Omega baryon pairs in electron-positron collisions at energies between 3.49 and 3.67 GeV, providing upper limits on cross sections and form factors, and testing theoretical models.

Contribution

It presents the first experimental upper limits on the cross sections and form factors for $e^+e^- o \Omega^- ar{\Omega}^+$ in this energy range, with no significant threshold effects observed.

Findings

Upper limits on Born cross sections established

Effective form factor consistent with theoretical predictions

No significant threshold effect observed

Abstract

Using data samples of $e^+e^-$ collisions collected with the BESIII detector at eight center-of-mass energy points between 3.49 and 3.67 GeV, corresponding to an integrated luminosity of 670 pb$^{-1}$, we present the upper limits of Born cross sections and the effective form factor for the process $e^+e^-\rightarrow\Omega^{-}\bar\Omega^{+}$. A fit to the cross sections using a pQCD-derived energy dependent function shows no significant threshold effect. The upper limit on the measured effective form factor is consistent with a theoretical prediction within the uncertainty of 1$\sigma$. These results provide new experimental information on the production mechanism of $\Omega$.