Fluctuations in heavy ion collisions and global conservation effects

Roman Poberezhnyuk; Volodymyr Vovchenko; Oleh Savchuk; Volker Koch; Mark Gorenstein; Horst Stoecker

doi:10.1051/epjconf/202327601005

All issues

Volume 276 (2023)

EPJ Web Conf., 276 (2023) 01005

Abstract

Open Access

Issue		EPJ Web Conf. Volume 276, 2023 The 20^th International Conference on Strangeness in Quark Matter (SQM 2022)


Article Number		01005
Number of page(s)		5
Section		Bulk Matter Phenomena, QCD Phase Diagram, and Critical Point
DOI		https://doi.org/10.1051/epjconf/202327601005
Published online		01 March 2023

EPJ Web of Conferences 276, 01005 (2023)
https://doi.org/10.1051/epjconf/202327601005

Fluctuations in heavy ion collisions and global conservation effects

Roman Poberezhnyuk¹^,2^*, Volodymyr Vovchenko³^,4^,2, Oleh Savchuk¹^,5^,2, Volker Koch⁴, Mark Gorenstein¹^,2 and Horst Stoecker²^,6^,5

¹ Bogolyubov Institute for Theoretical Physics, 03680 Kiev, Ukraine
² Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany
³ Institute for Nuclear Theory, University of Washington, Box 351550, Seattle, WA 98195, USA
⁴ Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
⁵ GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, D-64291 Darmstadt, Germany
⁶ Institut für Theoretische Physik, Goethe Universität Frankfurt, D-60438 Frankfurt am Main, Germany

^* e-mail: rpoberezhnyuk@bitp.kiev.ua, poberezhnyuk@fias.uni-frankfurt.de

Published online: 1 March 2023

Abstract

Subensemble is a type of statistical ensemble which is the generalization of grand canonical and canonical ensembles. The subensemble acceptance method (SAM) provides general formulas to correct the cumulants of distributions in heavy-ion collisions for the global conservation of all QCD charges. The method is applicable for an arbitrary equation of state and sufficiently large systems, such as those created in central collisions of heavy ions. The new fluctuation measures insensitive to global conservation effects are presented. The main results are illustrated in the hadron resonance gas and van der Waals fluid frameworks.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).

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