Determination of freeze-out conditions from fluctuations in the Hadron Resonance Gas model

FAIR Next Generation ScientistS 2014

Alba, P.^1 ; Alberico, W.^1 ; Bellwied, R.^2 ; Bluhm, M.^3 ; Mantovani Sarti, V.^1 ; Nahrgang, M.^4 ; Ratti, C.^1,2

Department of Physics, Torino University and INFN, Sezione di Torino, via P. Giuria 1, Torino

10125, Italy^1

Department of Physics, University of Houston, Houston

TX

77204, United States^2

Department of Physics, North Carolina State University, Raleigh

NC

27695, United States^3

Department of Physics, Duke University, Durham

NC

27708-305, United States^4

关键词: Collision energies;    Freeze out;    Hadron resonance gas;    Heavy ion collision;    Lattice analysis;    Model approach;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/599/1/012021/pdf
DOI  :  10.1088/1742-6596/599/1/012021

来源: IOP

【 摘 要 】

Fluctuations of conserved charges measured in Heavy-Ion Collisions (HICs) received increasing attention in recent years, because they are good candidates to explore the phase diagram of QCD matter. During the last year, net-electric charge and net-proton moments of multiplicities measured at RHIC have been published by the STAR collaboration, for a range of collision energies which spans a region of the phase diagram at finite chemical potential. Here we present a new freeze-out curve obtained using the Hadron Resonance Gas (HRG) model approach to fit these experimental data. The HRG model is modified in order to have a realistic description of the HICs: kinematic cuts, resonance feed-down and resonance regeneration are taken into account. Our result is in agreement with preliminary studies by the ALICE collaboration, and is supported by a recent lattice analysis of the same quantities.