QCD chiral symmetry restoration with a large number of quarks in a model with a confining propagator and dynamically massive gluons

Abstract

Considering a QCD chiral symmetry breaking model where the gap equation contains an effective confining propagator and a dressed gluon propagator with a dynamically generated mass, we verify that the chiral symmetry is restored for a large number of quarks nf≈7−13. We discuss the uncertainty in the results, that is related to the determination of the string tension (KF), appearing in the confining propagator, and the effective gluon mass (mg) at large nf. Keywords: Chiral symmetry restoration, Effective gluon mass, Confinement