Abstract
We study the features of a nonlocal SU(3) Polyakov-Nambu-Jona-Lasinio model that includes wave function renormalization. Model parameters are determined from vacuum phenomenology considering lattice QCD-inspired nonlocal form factors. Within this framework we analyze the properties of light scalar and pseudoscalar mesons at finite temperature and chemical potential determining characteristics of deconfinement and chiral restoration transitions.
Highlights
The strong interaction among quarks depends on their color charge
In principle, they could arise at different critical temperatures, leading to a quarkyonic phase, in which the chiral symmetry is restored while quarks and gluons remain confined
Along this work we have studied light scalar and pseudoscalar meson properties and the characteristics of deconfinement and chiral restoration transitions in the context of a three-flavor nonlocal chiral model
Summary
The strong interaction among quarks depends on their color charge. When quarks are placed in a medium, this charge is screened due to density and temperature effects [1]. The nonlocal Polyakov-Nambu-JonaLasinio (nlPNJL) models (see [8] and references therein), in which quarks interact through covariant nonlocal chirally symmetric four- and six-point couplings in a background color field, and gluon self-interactions are effectively introduced by a Polyakov loop effective potential These approaches, which can be considered as an improvement over the (local) PNJL model, offer a common framework to study both the chiral restoration and deconfinement transitions. Some previous works have addressed the study of meson properties and/or phase transitions using nlPNJL models with Gaussian nonlocal form factors, for specific Polyakov potentials [10] These functional forms can be improved, since it is possible to choose model parameters and momentum dependences for the form factors so as to fit the quark propagators obtained in lattice QCD.
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