$K/\pi$, $K/p$ and $p/\pi$ Ratio Fluctuations within the HSD Transport Approach

TL;DR

This study uses the HSD transport model to analyze particle ratio fluctuations in heavy-ion collisions, successfully reproducing experimental data and providing predictions for future experiments.

Contribution

It demonstrates that the HSD model can qualitatively reproduce observed particle ratio fluctuations across a wide energy range in heavy-ion collisions.

Findings

HSD model reproduces $K/\pi$ ratio fluctuations from SPS to RHIC energies.

Predictions challenge future experimental measurements.

Provides insight into particle production mechanisms.

Abstract

Particle number fluctuations and correlations in nucleus-nucleus collisions at SPS and RHIC energies have been studied within the Hadron-String-Dynamics (HSD) transport approach. Event-by-event fluctuations of pion-to-kaon, proton-to-pion and kaon-to-proton number ratios are calculated for the samples of most central collision events and compared with the available experimental data. It has been found that the HSD model can qualitatively reproduce the measured excitation function for the $K/\pi$ ratio fluctuations in central Au+Au (or Pb+Pb) collisions from low SPS up to top RHIC energies. These predictions impose a challenge for future experiments.