Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Heavy-Ion Collisions and QCD Phases IX

HK 36.4: Vortrag

Mittwoch, 1. April 2020, 17:30–17:45, J-HS H

The QCD phase diagram and baryon number fluctuations from Dyson-Schwinger equations — •Philipp Isserstedt1, Michael Buballa2, Christian S. Fischer1, and Pascal J. Gunkel11Institut für Theoretische Physik, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany — 2Theoriezentrum, Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany

In this talk we summarize our latest results on the QCD phase diagram and baryon number fluctuations using the nonperturbative framework of Dyson-Schwinger equations [1]. To this end, we solve a coupled set of these equations for the quark and gluon propagators of three-flavor QCD in Landau gauge. We present fluctuations and ratios thereof up to fourth order, ranging from vanishing chemical potential to the critical endpoint. In comparison with preliminary experimental data from the STAR collaboration for the skewness and kurtosis ratios, our results are compatible with a critical endpoint at large chemical potential and a freeze-out line that bends below it.

[1] P. Isserstedt, M. Buballa, C. S. Fischer, and P. J. Gunkel, Phys. Rev. D 100, 074011 (2019), arXiv:1906.11644

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