Study of e+e−→Ω−Ω¯+ at center-of-mass energies from 3.49 to 3.67 GeV
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Abstract
Using data samples of ${e}^{+}{e}^{\ensuremath{-}}$ 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 $670\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$, we present the upper limits of Born cross sections and the effective form factor for the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}{\overline{\mathrm{\ensuremath{\Omega}}}}^{+}$. 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 $1\ensuremath{\sigma}$. These results provide new experimental information on the production mechanism of $\mathrm{\ensuremath{\Omega}}$.
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