The WA89 Collaboration

arXiv1998

Charge Asymmetries for D, D_s and Lambda_c Production in Sigma- - Nucleus Interactions at 340 GeV/c

CERN experiment WA89 has studied charmed particles produced by a Sigma^- beam at 340 GeV/c on nuclear targets. Production of particles which have light quarks in common with the beam is compared to production of those which do not. Considerable production asymmetries between D^- and D^p, D_s^ and D_s^+ and Lambda_c and Antilambda_c are observed. The results are compared with pion beam data and with theoretical calculations.

hep-ex↗

arXiv1997

Xi^- Production by Sigma^-, pi^- and Neutrons in the Hyperon Beam Experiment at CERN

Inclusive cross sections for Xi^- hyperon production in high-energy Sigma^-, pi^- and neutron induced interactions were measured by the experiment WA89 at CERN. Secondary Sigma^- and pi^- 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 Xi^- produced by Sigma^- is observed. The influence of the target mass on the Xi^- cross section is explored by comparing reactions on copper and carbon nuclei.

hep-ex↗