Ξ− production by Σ−. π− and neutrons in the hyperon beam experiment WA89 at CERN

Abstract

Inclusive cross sections for Ξ − hyperon production in high-energy Σ − , π − and neutron induced interactions were measured by the experiment WA89 at CERN. Secondary Σ − and π − beams with average momenta of 345 GeV/c and a neutron beam of average momentum 65 GeV/c were produced by primary protons of 450 GeV/c from the CERN SPS. Both single and double differential cross sections are presented as a function of the transverse momentum and the Feynman variable x F. A strong leading effect for Ξ − produced by Σ − is observed. The influence of the target mass on the Ξ − cross section is explored by comparing reactions on copper and carbon nuclei.