Probing freeze-out conditions in heavy ion collisions with moments of charge fluctuations

By F. Karsch, K. Redlich. 2010

227 citations recorded by the source corpus.

Abstract We calculate the first four moments of baryon number, electric charge and strangeness fluctuations within the hadron resonance gas model. Different moments and their ratios as well as skewness and kurtosis are evaluated on the phenomenologically determined freeze-out curve in the temperature, baryon chemical potential plane. The model results and its predictions as well as relations between different moments are compared with the first data on net proton fluctuations in Au–Au collisions obtained at RHIC by the STAR Collaboration. We find good agreement between the model calculations and experimental results. We also point out that higher order moments should be more sensitive to critical behavior and will also distinguish hadron resonance gas model calculations from results obtained from lattice QCD.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/28b432deac4f641952a835ad637f62b22430d353

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In Nuclear and High Energy Physics

Citations in the corpus

Polyakov loop modeling for hot QCD (2017, background): “The so-called kurtosis defined by the ratio, χ4 /χ B 2 , is known as a good probe of the deconfinement transition; as we demonstrate below, at zero chemical potential, it reflects the quark content of physical degrees of freedom that carry the baryon number [193, 194].”
Search for the QCD critical point with fluctuations of conserved quantities in relativistic heavy-ion collisions at RHIC: an overview (2017, methodology): “The results are calculated from the HRG model [48]”
QCD at finite temperature and chemical potential from Dyson–Schwinger equations (2018, methodology): “Ratios of generalised susceptibilities have been used to extract the freeze-out points from experimental data from first principles lattice calculations [124, 125] that can be compared with those obtained from the Hadron Resonance Gas model [127].”