Measurement of e+e−→ pK−Λ ¯ + c. c. cross sections between 4.009 GeV and 4.951 GeV

Using e + e − collision datasets corresponding to a total integrated luminosity of 21.7 fb−1 collected with the BESIII detector at the BEPCII collider at center-of-mass energies ranging from 4.009 GeV to 4.951 GeV, the energy-dependent cross sections of e+e−→ pK−Λ ¯ + c. c. are measured for the first time. By fitting these energy-dependent cross sections, we search for the excited ψ states ψ(4160) and ψ(4415), and the vector charmonium-like states ψ(4230), ψ(4360), and ψ(4660). No evidence for these is observed and the upper limits on the branching fractions of these states decaying into pK−Λ ¯ + c. c. are set at the 90% confidence level.