Recent Results of Fluctuation and Correlation Studies from the STAR Experiment

TL;DR

This paper reviews recent STAR experiment results on fluctuations and correlations near the QCD phase transition, highlighting their potential to reveal the nature of the critical point through particle ratio fluctuations and multiplicity correlations.

Contribution

It presents new experimental data on fluctuations and correlations related to the QCD phase transition and discusses measurement possibilities in the RHIC beam energy scan.

Findings

Observation of enhanced fluctuations near the critical point

Analysis of particle ratio fluctuations (K/π, p/π)

Study of forward-backward multiplicity correlations

Abstract

Enhanced fluctuations and correlations have been observed in the phase transitions of many systems. Their appearance at the predicted QCD phase transition (especially near the expected critical point) may provide insight into the nature of the phase transition. Recent results from the STAR experiment will be presented with a focus on particle ratio (K/$\pi$ and p/$\pi$) fluctuations, forward-backward multiplicity correlations, and balance functions. Also discussed will be possibilities for measuring these correlations and fluctuations in the recently initiated beam energy scan at RHIC.