Investigation of the (anti p)p (yields) (anti (Lambda)) (Lambda) and (anti p)p (yields) (anti (Sigma))(sup 0) (Lambda) + c.c. reactions near threshold

摘要

Experiment PS 185 studies the production of antihyperon-hyperon pairs in antiproton-proton collisions at LEAR in the near-threshold energy region. The (ital (anti p) p) (r arrow) (anti (Lambda))(Lambda) reaction has been thoroughly studied by PS185 and many high-quality data have been reported. New results, including total and differential cross sections along with spin observables, are presented here for the channels (ital (anti p) p) (r arrow) (anti (Lambda))(Lambda) and (ital (anti p)p) (r arrow) (anti (Sigma))(sup 0)(Lambda) + c.c at incident lab antiproton momenta of 1.726 and 1. 771 GeV/c. The data from the relatively unstudied and complementary (ital (anti p)p) (r arrow) (anti (Sigma))(sup 0)(Lambda) + c.c channel is compared to that from (ital (anti p)p) (r arrow) (anti (Lambda))(Lambda) at similar energies above the reaction threshold.