Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 47: Heavy Ions V

HK 47.3: Talk

Thursday, March 11, 2004, 17:30–17:45, E

Contribution of the nucleon-hyperon reaction channels to K⁻ production in proton-nucleus collisions — •Hanns-Werner Barz and Lothar Naumann — Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf

The cross sections for producing K⁻ mesons in nucleon-hyperon elementary processes are estimated using the experimentally known pion-hyperon cross sections. The results are implemented in a transport model which is applied to calculation of proton-nucleus collisions. In significant difference to earlier estimates in heavy-ion collisions the inclusion of the nucleon-hyperon cross section roughly doubles the K⁻ production in near-threshold proton-nucleus collisions. Calculations for K⁺ and K⁻ production in proton on carbon and gold collisions are compared to recent measurements carried out by the KaoS collaboration.