Strange Antibaryon Production Data and Reduction of Strangeness Suppression in Sulphur-Nucleus Collisions at 200A GeV

We have used the event generator LUCIAE to analyse NA35 data of the ¯p and ¯ Λ yields, the ratio ¯ Λ/¯p, and the transverse mass distributions of ¯p and ¯ Λ in pp and central sulphur-nucleus collisions at 200A GeV. The NA35 data could be reproduced reasonably if one assumes that the s quark pair suppression factor and concerns in nucleus-nucleus collisions are larger than the nucleon-nucleon collision. It seems to indicate that NA35 data might imply the reduction of strangeness suppression in ultrarelativistic nucleus-nucleus collisions comparing to the nucleon-nucleon collision at the same energy. However, the ratio ¯ Λ/¯p approaching to unity in AA collisions comparing to the pp collision does not necessarily mean a flavor symmetry since hadronic rescattering plays a role as well. PACS number: 25.75.+r Strangeness production is expected to be a powerful probe for the mechanism of nucleus-nucleus collisions. Strangeness enhancement, the increased strangeness particle production in nucleus-nucleus collisions comparing to the 1 mailing address.