Abstract
We present an analysis of fluctuations of conserved charges, as baryon number B and electric charge Q , using the Hadron Resonance Gas (HRG) model. The study of such observables within a theoretical approach and the comparison to experimental data on the moments of the multiplicity distributions of specific particles represents a useful tool to extract the chemical freeze-out parameters, temperature T and baryo-chemical potential μ B . In particular we calculate ratios of higher-order susceptibilities for net-protons and net-charge and we compare our results to the latest data from STAR collaboration. The effect of resonance decays and kinematic cuts applied in the experimental analysis in transverse momentum, rapidity and pseudo-rapidity are included in the calculation along with the randomization of nucleons occurring in the hadronic phase.
Highlights
IntroductionEPJ Web of Conferences approach [10,11,12,13,14,15] has been proposed as another tool to obtain the values of the freeze-out parameters and experimental data for these observables have been published by the STAR collaboration [16, 17]
The understanding and the description of the phase diagram of nuclear matter under extreme conditions, high temperature T and/or baryo-chemical potential μB, represent major theoretical and experimental challenges
Heavy Ion Collisions (HICs) at experimental facilities provide a unique tool to explore a wide area of this phase diagram, from the high baryo-chemical region covered by AGS, SPS, Beam Energy Scan at RHIC and the future NICA and FAIR facilities to the high temperature regime covered by top energies at RHIC and LHC
Summary
EPJ Web of Conferences approach [10,11,12,13,14,15] has been proposed as another tool to obtain the values of the freeze-out parameters and experimental data for these observables have been published by the STAR collaboration [16, 17]. The study of fluctuations of conserved charges in a HRG approach can overcome some of the limitations of LQCD calculations since it allows us to include the experimental acceptance cuts on transverse momentum, rapidity and pseudo-rapidity to study observables for individual particle species and to explore the finite μB regime. By comparing our results to data from the STAR collaboration, we extract a chemical freeze-out parametrization in a large range of collision energies
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