QCD confinement and chiral crossovers, two critical points

Physics – High Energy Physics – High Energy Physics - Lattice

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10 pages, 9 figures, work done partly under the PT-LQCD Collaboration, contribution to the proceedings of Many Faces of QCD, 2

Scientific paper

We study the QCD phase diagram, in particular we study the critical points of the two main QCD phase transitions, confinement and chiral symmetry breaking. Confinement drives chiral symmetry breaking, and, due to the finite quark mass, at small density both transitions are a crossover, while they are a first or second order phase transition in large density. We study the QCD phase diagram with a quark potential model including both confinement and chiral symmetry. We present the confinement of quark fields into a flux tube, obtained in SU(3) quenched lattice QCD, to illustrate the importance of the confining quark-antiquark potential. Our finite temperature con-fining potential is extracted from the Lattice QCD data of the Bielefeld group. Our formalism, the Coulomb gauge hamiltonian of QCD, is presently the only one able to microscopically include both a quark-antiquark confining potential and a vacuum condensate of quark-antiquark pairs. This model is able to address all the excited hadrons, and chiral symmetry breaking, at the same token. Our order parameters are the Polyakov loop and the quark mass gap. We address how the quark masses affect the critical point location in the phase diagram.

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