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

Abstract

We have used the event generator LUCIAE to analyse NA35 data of the $\bar{p}$ and $\bar{\Lambda }$ yields, the ratio $\bar{\Lambda }/\bar{p}$, and the transverse mass distributions of $\bar{p}$ and $\bar{\Lambda }$ 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 $\bar{\Lambda }/\bar{p}$ 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.

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