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 $n_f\approx 7-13$. We discuss the uncertainty in the results, that is related to the determination of the string tension ($K_F$), appearing in the confining propagator, and the effective gluon mass ($m_g$) at large $n_f$.

Comments: 5 pages, 6 figures