Exploring the QCD phase diagram via the collision energy dependence of multi-particle femtoscopy with PHENIX

Abstract

Exploration of the rich structure of the QCD phase diagram is an important topic in the RHIC heavy ion program. One of the ultimate goals of this program is to search for the critical endpoint. Investigation of the space-time structure of hadron emissions at various phase transition points using Bose-Einstein correlations of identical bosons may provide insight on the location of the critical endpoint. PHENIX has performed comprehensive measurements of the Bose-Einstein correlation in Au+Au collisions at sqrt(sNN) = 15, 19, 27, 39, 62.4, and 200 GeV, where we incorporated Levy-type source functions to describe the measured correlation functions. We put particular focus on one of the parameters of the Levy-type source functions, the index of stability alpha, which is related to one of the critical exponents (the so-called correlation exponent eta). We have measured its collision energy and centrality dependence. We have also extended our analysis from two-particle to three-particle correlations to characterize the nature of the hadron emission source. The three particle correlations confirmed the findings of the two-particle correlations, and also provide insight on the pion production mechanism beyond the core-halo model.

Proceedings of the Winter Workshop on Nuclear Dynamics (1-7 March 2020)

References in corpus (6)

• Source breakup dynamics in Au+Au Collisions at sqrt(s_NN)=200 GeV via three-dimensional two-pion source imaging
• Three dimensional Lévy HBT results from PHENIX
• Centrality dependent Lévy-stable two-pion Bose-Einstein correlations at the PHENIX experiment
• Two- and three-pion Levy femtoscopy with PHENIX
• PHENIX results on collision energy dependent Levy HBT correlations from $\sqrt{s_{NN}}$ = 15 to 200 GeV
• Three particle Lévy HBT from PHENIX