Cumulants and correlation functions versus the QCD phase diagram

作     者：Adam Bzdak Volker Koch Nils Strodthoff 

作者机构：AGH University of Science and Technology Faculty of Physics and Applied Computer Science 30-059 Kraków Poland Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA 

出 版 物：《Physical Review C》 (物理学评论C辑：核物理学)

年 卷 期：2017年第95卷第5期

页      面：054906-054906页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：Ministry of Science and Higher Education (MNiSW) National Science Centre [DEC-2014/15/B/ST2/00175] Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Divisions of Nuclear Physics, of the US Department of Energy [DE-AC0205CH11231] DFG [STR1462/1-1] DEC2013/09/B/ST2/00497 

主　　题：Particle correlations & fluctuations QCD phase transitions Relativistic heavy-ion collisions 

摘      要：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.