Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 66: Heavy Ion Collision and QCD Phases XIII
HK 66.4: Talk
Friday, March 18, 2016, 15:00–15:15, S1/01 A04
Modeling chiral criticality and its consequences for heavy-ion collisions — •Gabor Almasi1, Bengt Friman1,2, and Krzysztof Redlich2,3,4 — 1Gesellschaft für Schwerionenforschung, GSI, D-64291 Darmstadt, Germany — 2ExtreMe Matter Institute (EMMI), D-64291 Darmstadt, Germany — 3University of Wrocław - Faculty of Physics and Astronomy, PL-50-204 Wrocław, Poland — 4Department of Physics, Duke University, Durham, NC 27708, USA
We explore the critical fluctuations near the chiral critical endpoint (CEP), which belongs to the Z(2) universality class, in a chiral effective model and discuss possible signals of the CEP, recently explored in nuclear collision experiments [1]. Particular attention is attributed to the dependence of such signals on the location of the phase boundary and the CEP relative to the hypothetical freeze-out conditions in nuclear collisions. We argue that in effective models freeze-out fits to heavy-ion results should not be used directly, and relevant quantities should be investigated on lines of the phase diagram, that are defined self-consistently in the framework of the model [2]. We discuss possible choices for such an approach. Additionally we discuss the effect of the repulsive vector interaction of quarks on the location of the CEP and on the structure of the baryon number cumulant ratios.
[1] L. Adamczyk, et al., Phys. Rev. Lett. 112 (2014) 032302.
[2] G. Almasi, B. Friman, and K. Redlich, Quark Matter 2015 Proceedings, to be published.