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HK: Fachverband Physik der Hadronen und Kerne

HK 66: Heavy Ion Collision and QCD Phases XIII

HK 66.4: Vortrag

Freitag, 18. März 2016, 15:00–15:15, S1/01 A04

Modeling chiral criticality and its consequences for heavy-ion collisions — •Gabor Almasi¹, Bengt Friman^1,2, and Krzysztof Redlich^2,3,4 — 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.