Estimation of the freeze-out parameters reachable in the AFTER@LHC project

TL;DR

This paper estimates the variation of freeze-out parameters, especially baryon chemical potential, across rapidity in Pb+Pb collisions at 72 GeV for the AFTER@LHC project, highlighting its potential to explore the QCD phase diagram.

Contribution

It introduces a method to estimate rapidity-dependent freeze-out parameters using the hadron resonance gas model with UrQMD-generated events for the AFTER@LHC setup.

Findings

Baryon chemical potential increases by at least 2.5 times at forward rapidity.

Rapidity range 0<y<4.5 covers μ_B similar to RHIC Beam Energy Scan.

Rapidity scan at AFTER@LHC complements existing QCD phase diagram studies.

Abstract

Estimation of the freeze-out parameters as the function of rapidity in Pb+Pb collisions at $\sqrt{s_{NN}}=72$ GeV in the AFTER@LHC project is performed. The conventional hadron resonance gas model is used for the analysis of the events generated by the UrQMD model. The results indicate that one may obtain at least $2.5$ times increase of baryon chemical potential $\mu_B$ in the forward rapidity range as compared to the mid-rapidity. The $\mu_B$ values in the rapidity range of $0 < y < 4.5$ for AFTER@LHC are comparable to that covered by the RHIC Beam Energy Scan program. Thus, a rapidity scan in the AFTER@LHC project provides a complementary approach to study the QCD phase diagram.