Phase structure of three and four flavor QCD
Abstract
We investigate the phase structure of QCD at finite temperature and lightquark chemical potential. We improve upon earlier results for N_{f}=2+1 dynamical quark flavors and investigate the effects of charm quarks in an extension to N_{f}=2+1+1. We determine the quark condensate and the Polyakov loop potential using solutions of a coupled set of (truncated) DysonSchwinger equations for the quark and gluon propagators of Landau gauge QCD. At zero chemical potential we find excellent agreement with results from latticeQCD. With input fixed from physical observables we find only a very small influence of the charm quark on the resulting phase diagram at finite chemical potential. We discuss the location of the emerging critical end point and compare with expectations from lattice gauge theory.
 Publication:

Physical Review D
 Pub Date:
 August 2014
 DOI:
 10.1103/PhysRevD.90.034022
 arXiv:
 arXiv:1405.4762
 Bibcode:
 2014PhRvD..90c4022F
 Keywords:

 12.38.Aw;
 11.10.Wx;
 12.38.Lg;
 General properties of QCD;
 Finitetemperature field theory;
 Other nonperturbative calculations;
 High Energy Physics  Phenomenology;
 High Energy Physics  Lattice;
 Nuclear Theory
 EPrint:
 10 pages, 9 figures, v2: typos corrected, minor changes, version accepted by PRD