First measurement of the cross sections for e⁺e^-? K⁰K^-p⁺J/? + c.c. at s from 4.396 to 4.951 GeV

Using e⁺e^- collision data at 19 center-of-mass energies ranging from 4.396 to 4.951 GeV corresponding to a total integrated luminosity of 8.86 fb^-1 collected by the BESIII detector, the process e⁺e^- ? K⁰K^-p⁺J/? + c.c. is observed for the first time, with a statistical significance of 9.4s summing up all the data samples. Here, c.c. stands for the charge conjugated mode. For this process, the cross section and the upper limit at the 90% confidence level are reported at each of the 19 center-of-mass energies. No statistically significant vector structures are observed in the cross section line shape, nor as intermediate states of combinations of Kp, KK¯, KK¯p, KJ/?, pJ/?, and KpJ/? seen at individual energy points or in the combined data sample.