System-size dependence of Lambda and Xi production in nucleus--nucleus collisions at 40A and 158A GeV measured at the CERN Super Proton Synchrotron

TL;DR

This study examines how the production of Lambda, Anti-lambda, and Xi- particles varies with system size in nucleus-nucleus collisions at CERN SPS energies, comparing experimental data to transport models and the core-corona approach.

Contribution

It provides the first detailed analysis of system-size dependence of strange particle production at these energies, highlighting the strengths and limitations of current models.

Findings

Transport models describe Lambda and Anti-lambda well but fail for Xi-.

Core-corona approach fits Lambda and Xi- system-size dependence.

Discrepancies observed between models and Anti-lambda data.

Abstract

Results on Lambda, Anti-lambda, and Xi- production in centrality selected Pb+Pb reactions at 40A and 158A GeV and in near-central C+C and Si+Si reactions at 158A GeV are presented. Transverse mass spectra, rapidity spectra, and multiplicities in dependence of the system size are discussed. Comparisons to transport models (UrQMD2.3 and HSD) and to the core-corona approach are performed. While Lambda and Anti-lambda production can be described by transport models reasonably well, these models do not agree with the Xi- measurements. On the other hand, the core-corona picture fits very well the system-size dependence of Lambda and Xi-, while it agrees less well with the Anti-lambda data.