Net Baryon Fluctuations from a Crossover Equation of State

Abstract

We have constructed an equation of state which smoothly interpolates between an excluded volume hadron resonance gas at low energy density to a plasma of quarks and gluons at high energy density. This crossover equation of state agrees very well with lattice calculations at both zero and nonzero baryon chemical potential. We use it to compute the variance, skewness, and kurtosis of fluctuations of baryon number, and compare to measurements of proton number fluctuations in central Au-Au collisions as measured by the STAR collaboration in a beam energy scan at the Relativistic Heavy Ion Collider. The crossover equation of state can reproduce the data if the fluctuations are frozen out at temperatures well below than the average chemical freeze-out.

arXiv comment5 pages, 7 figures. arXiv admin note: substantial text overlap with arXiv:1506.03408

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Cited by in corpus (6)

• Criticality in a Hadron Resonance Gas model with the van der Waals interaction
• Interacting hadron resonance gas model in K-matrix formalism
• Thermodynamics of strongly interacting matter in a hybrid model
• Thermodynamics of a gas of hadrons with attractive and repulsive interaction within S-matrix formalism
• Exploring the hadron resonance gas phase on the QCD phase diagram
• Universal descriptions of chemical freeze-out based on pressure and specific heat