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Baryon effects on the location of QCD’s critical end point

Gernot Eichmann, Christian S. Fischer, and Christian A. Welzbacher

  • Institut für Theoretische Physik, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, D-35392 Gießen, Germany

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Phys. Rev. D 93, 034013 – Published 8 February, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.034013

Abstract

The location of the critical end point of QCD has been determined in previous studies of Nf=2+1 and Nf=2+1+1 dynamical quark flavors using a (truncated) set of Dyson-Schwinger equations for the quark and gluon propagators of Landau-gauge QCD. A source for systematic errors in these calculations has been the omission of terms in the quark-gluon interaction that can be parametrized in terms of baryonic degrees of freedom. These have a potentially large dependence on chemical potential and therefore may affect the location of the critical end point. In this exploratory study we estimate the effects of these contributions, both in the vacuum and at finite temperature and chemical potential. We find only a small influence of baryonic contributions on the location of the critical end point. We estimate the robustness of this result by parameterizing further dependencies on chemical potential.

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Phys. Rev. D 93, 034013– Published 8 February, 2016
  • Received 15 September 2015

© 2016 American Physical Society

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