Abstract
We study the features of a SU(2) Polyakov-Nambu-Jona-Lasinio model that includes wave function renormalization and nonlocal vector interactions. Within this framework we analyze, among other properties, the masses, width and decay constants of light vector and axial-vector mesons at finite temperature. Then we obtain the corresponding phase diagram in a finite density scenario, after characterizing the deconfinement and chiral restoration transitions.
Highlights
The phase diagram of strongly interacting matter at finite temperature T and chemical potential μ has been extensively studied along the past decades
We perform a fit to lattice QCD (lQCD) results quoted in Ref. [41] for the functions mðpÞ and zðpÞ, from which we obtain the values of Λ0 and Λ1
When the chiral restoration transition is first order (μ > μCEP), as the temperature increases we find a transition from a hadronic phase with broken chiral symmetry (BP), to a quarkyonic phase (QP) where the chiral symmetry is restored but the quarks are still confined into hadrons
Summary
The phase diagram of strongly interacting matter at finite temperature T and chemical potential μ has been extensively studied along the past decades. Quantum chromodynamics (QCD) predicts that at very high temperatures (T ≫ ΛQCD) and low densities this matter appears in the form of a plasma of quarks and gluons [1]. At such extreme conditions, QCD is weakly coupled and first-principle perturbative calculations based on an expansion in the coupling constant can be used to explore the phase diagram. Substantial progress has been achieved in this sense through lattice QCD (lQCD) calculations, this approach shows significant difficulties, e.g., when dealing with small current quark masses and/or finite chemical potential. Most of the present knowledge about the behavior of strongly interacting matter arises from the study of effective models, which offer the possibility to get predictions of the transition features at regions that are not accessible through lattice techniques
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