Fluctuations of conserved charges within a Hadron Resonance Gas approach: chemical freeze-out conditions from net-charge and net-proton fluctuations

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.

[1]  G. S. Averichev,et al.  Beam energy dependence of moments of the net-charge multiplicity distributions in Au+Au collisions at RHIC. , 2014, Physical review letters.

[2]  R. Bellwied,et al.  Freeze-out conditions from net-proton and net-charge fluctuations at RHIC , 2014, 1403.4903.

[3]  Z. Fodor,et al.  Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency? , 2014, Physical review letters.

[4]  G. S. Averichev,et al.  Energy Dependence of Moments of Net-proton Multiplicity Distributions at RHIC , 2013, 1309.5681.

[5]  Z. Fodor,et al.  Full result for the QCD equation of state with 2+1 flavors , 2013, 1309.5258.

[6]  A. Beraudo,et al.  Lattice QCD-based equations of state at vanishing net-baryon density , 2013, 1306.6188.

[7]  Z. Fodor,et al.  Is there a flavor hierarchy in the deconfinement transition of QCD? , 2013, Physical review letters.

[8]  Z. Fodor,et al.  Freeze-out parameters: lattice meets experiment. , 2013, Physical review letters.

[9]  Jinghua Fu,et al.  Higher moments of net-proton multiplicity distributions in heavy ion collisions at chemical freeze-out , 2013 .

[10]  D. K. Mishra,et al.  Conserved number fluctuations in a hadron resonance gas model , 2013, 1304.7133.

[11]  A. Bazavov,et al.  Freeze-out conditions in heavy ion collisions from QCD thermodynamics. , 2012, Physical review letters.

[12]  K. Redlich.  Probing the QCD chiral cross-over transition in heavy ion collisions , 2012, 1207.2610.

[13]  Alan D. Martin,et al.  Review of Particle Physics: Particle data group , 2012 .

[14]  M. Kitazawa,et al.  Relation between baryon number fluctuations and experimentally observed proton number fluctuations in relativistic heavy ion collisions , 2012, 1205.3292.

[15]  F. Karsch.  Determination of freeze-out conditions from lattice QCD calculations , 2012, 1202.4173.

[16]  K. Redlich,et al.  Non-perturbative dynamics and charge fluctuations in effective chiral models , 2011, 1108.3231.

[17]  M. Kitazawa,et al.  Revealing baryon number fluctuations from proton number fluctuations in relativistic heavy ion collisions , 2011, 1107.2755.

[18]  A. Andronic,et al.  The thermal model on the verge of the ultimate test: particle production in Pb–Pb collisions at the LHC , 2011, 1106.6321.

[19]  K. Redlich,et al.  Probing freeze-out conditions in heavy ion collisions with moments of charge fluctuations , 2010, 1007.2581.

[20]  C. DeTar,et al.  The HotQCD Collaboration , 2009 .

[21]  A. Andronic,et al.  Thermal hadron production in relativistic nuclear collisions , 2009, 0901.2909.

[22]  F. Becattini,et al.  Chemical freeze-out in ultrarelativistic heavy ion collisions at s NN =130 and 200 GeV , 2008, 0806.4100.

[23]  V. Konchakovski,et al.  Multiplicity Fluctuations in Hadron-Resonance Gas , 2006, nucl-th/0606036.

[24]  A. Andronic,et al.  Hadron production in central nucleus-nucleus collisions at chemical freeze-out , 2005, nucl-th/0511071.

[25]  J. Cleymans,et al.  Comparison of chemical freeze-out criteria in heavy-ion collisions , 2005, hep-ph/0511094.

[26]  F. Becattini,et al.  Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions , 2005, hep-ph/0511092.

[27]  H. Bebie,et al.  The Role of the entropy in an expanding hadronic gas , 1992 .