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Using e + e − collision data corresponding to a total integrated luminosity of 12.9 fb −1 collected with the BESIII detector at the BEPCII collider, the exclusive Born cross sections and the effective form factors of the reaction e + e − → Ξ − Ξ+ are measured via the single baryon-tag method at 23 center-of-mass energies between 3.510 and 4.843 GeV. Evidence for the decay ψ(3770) → Ξ − Ξ+ is observed with a significance of 4.5σ by analyzing the measured cross sections together with earlier BESIII results. For the other charmonium(-like) states ψ(4040), ψ(4160), Y (4230), Y (4360), ψ(4415), and Y (4660), no significant signal of their decay to Ξ − Ξ+ is found. For these states, upper limits of the products of the branching fraction and the electronic partial width at the 90% confidence level are provided.

Abstract:Data sets were collected with the BESIII detector at the BEPCII collider at the center-of-mass energy of Author's Copy scattering events, the integrated luminosities of the two data sets are measured to be (44.49 ± 0.02 ± 0.44) pb −1 and (2916.94 ± 0.18 ± 29.17) pb −1 , respectively, where the first error is statistical and the second error is systematic.