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 $670{\mathrm{pb}}^{-1}$, we present the upper limits of Born cross sections and the effective form factor for the process $e^{+}{e}^{-}\to {\mathrm{\Omega }}^{-}{\overline{\mathrm{\Omega }}}^{+}$. A fit to the cross sections using a perturbative QCD-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 $\mathrm{\Omega }$.

• Received 7 December 2022
• Accepted 5 January 2023

DOI:https://doi.org/10.1103/PhysRevD.107.052003

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Published by the American Physical Society