Measurement of Born cross sections and effective form factors of e⁺e⁻→ ⁻̄⁺ from √s=3.7 to 4.7 GeV

A bstract Using e + e − collision data corresponding to an integrated luminosity of 22.7 fb − 1 , collected at center-of-mass energies between 3.7 and 4.7 GeV with the BESIII detector at the BEPCII storage ring, we measure the energy-dependent Born cross sections of e⁺e⁻→ ⁻̄⁺ e + e − → Ω − Ω ¯ + and the effective form factors of the Ω − baryon. The analysis employs a single baryon tagging method, and the results are consistent with theoretical predictions, providing critical constraints on the electromagnetic structure of the Ω − hyperon. No significant signal of charmonium or charmonium-like states decaying to ⁻̄⁺ Ω − Ω ¯ + is observed in the investigated energy range.