Net baryon fluctuations from a crossover equation of state

J. Kapusta, M. Albright, C. Young

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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.

Original languageEnglish (US)
Article number250
JournalEuropean Physical Journal A
Issue number8
StatePublished - Aug 1 2016

Bibliographical note

Publisher Copyright:
© 2016, SIF, Springer-Verlag Berlin Heidelberg.


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