Measurement of the Born cross section for e⁺e⁻→ pK⁻K⁻Ξ̄⁺ at √s=3.5-- 4.9 GeV

A bstract Using e + e − collision data corresponding to a total integrated luminosity of 20 fb − 1 collected with the BESIII detector at the BEPCII collider, we present a measurement of the Born cross section for the process e⁺e⁻→ pK⁻K⁻Ξ̄⁺ e + e − → p K − K − Ξ ¯ + at 39 center-of-mass energies between 3.5 and 4.9 GeV with a partial reconstruction technique. By performing a fit to the dressed cross section of e⁺e⁻→ pK⁻K⁻Ξ̄⁺ e + e − → p K − K − Ξ ¯ + with a power law function for continuum production and one resonance at a time for the ψ (3770), ψ (4040), ψ (4160), ψ (4230), ψ (4360), ψ (4415) or ψ (4660), respectively, the upper limits for the product of partial electronic width and branching fraction into the final state pK⁻K⁻Ξ̄⁺ p K − K − Ξ ¯ + for these resonances are determined at the 90% confidence level.