Study of Σ(1385) and Ξ(1321) hyperon and antihyperon production in deep inelastic muon scattering

Large samples of Λ, Σ(1385) and Ξ(1321) hyperons produced in the deep-inelastic muon scattering off a 6LiD target were collected with the COMPASS experimental setup at CERN. The relative yields of Σ(1385)+, Σ(1385)−, \(\bar{\varSigma}(1385)^{-}\), \(\bar{\varSigma}(1385)^{+}\), Ξ(1321)−, and \(\bar{\varXi}(1321)^{+}\) hyperons decaying into \(\varLambda(\bar{\varLambda})\pi\) were measured. The ratios of heavy-hyperon to Λ and heavy-antihyperon to \(\bar{\varLambda}\) were found to be in the range 3.8 % to 5.6 % with a relative uncertainty of about 10 %. They were used to tune the parameters relevant for strange particle production of the LEPTO Monte Carlo generator.