Cumulants and correlation functions versus the QCD phase diagram

Adam Bzdak, Volker Koch, and Nils Strodthoff
Phys. Rev. C 95, 054906 – Published 12 May 2017

Abstract

In this paper we discuss the relation of particle number cumulants and correlation functions. It is argued that measuring couplings of the genuine multiparticle correlation functions could provide cleaner information on possible nontrivial dynamics in heavy-ion collisions. We extract integrated multiproton correlation functions from the presently available experimental data on proton cumulants. We find that the STAR data contain significant four-proton correlations, at least at the lower energies, with indication of changing dynamics in central collisions. We also find that these correlations are rather long ranged in rapidity. Finally, using the Ising model, we demonstrate how the signs of the multiproton correlation functions may be used to exclude certain regions of the phase diagram close to the critical point.

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  • Received 18 September 2016

DOI:https://doi.org/10.1103/PhysRevC.95.054906

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Adam Bzdak*

  • AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, 30-059 Kraków, Poland

Volker Koch and Nils Strodthoff

  • Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA

  • *bzdak@fis.agh.edu.pl
  • vkoch@lbl.gov
  • nstrodthoff@lbl.gov

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Issue

Vol. 95, Iss. 5 — May 2017

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