Recent results on strangeness production from NA49

TL;DR

This paper summarizes recent measurements of strange particle production from NA49 across various collision systems and energies, highlighting new results, strangeness enhancement, and fluctuations, and comparing them with theoretical models.

Contribution

It provides new experimental data on strange particles and their fluctuations, and compares these results with existing models and other experiments, advancing understanding of strangeness production.

Findings

New measurements of $ar{ ext{K}}^{*}(892)^{0}$ production at 17.3 GeV.

Strangeness enhancement observed at 17.3 GeV compared to other experiments.

Energy dependence of $K/ ext{p}$ and $K/ ext{pi}$ fluctuations analyzed.

Abstract

We present a summary of measurements of strange particles performed by the experiment NA49 in inelastic p+p interactions, as well as semi-central C+C and Si+Si, central Pb+Pb, and minimum bias Pb+Pb collisions in the energy range $\sqrt{s_{NN}}$ = 6.3 - 17.3 GeV. New results on $\pi^{-}$, $K^{+}$ and $K^{-}$ production in minimum bias Pb+Pb collisions at $\sqrt{s_{NN}}$ = 8.7 and 17.3 are shown. Furthermore the strangeness enhancement factor at $\sqrt{s_{NN}}$ = 17.3 GeV is presented and compared to the results from NA57 and STAR. Energy dependence of strange particle yields normalized to pion yields is presented. New data on $<K^{*}(892)^{0}>$ production are shown at $\sqrt{s_{NN}}$ = 17.3 GeV. Furthermore we present the energy dependence of $K/\pi$ and $K/p$ fluctuations. The data are compared with model predictions.