Baryon Number Fluctuations in Quasi-particle Model

TL;DR

This paper investigates baryon number fluctuations within a quasi-particle model of quark-gluon plasma, comparing theoretical predictions with experimental data to explore the QCD phase transition and critical point.

Contribution

It introduces calculations of baryon number moments in a quasi-particle model and compares them with RHIC data to constrain the model and guide QCD critical point searches.

Findings

Model describes high-energy data well

Large discrepancies at low energies

Provides baseline for critical point search

Abstract

Baryon number fluctuations are sensitive to the QCD phase transition and QCD critical point. According to the Feynman rules of finite-temperature field theory, we calculated various order moments and cumulants of the baryon number distributions in the quasi-particle model of quark gluon plasma. Furthermore, we compared our results with the experimental data measured by the STAR experiment at RHIC. It is found that the experimental data can be well described by the model for the colliding energies above 30 GeV and show large discrepancies at low energies. It can put new constraint on qQGP model and also provide a baseline for the QCD critical point search in heavy-ion collisions at low energies.