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We investigate the spontaneous breaking of chiral symmetry in QCD by means ofa recently proposed approximation scheme in the Landau-gauge Curci-Ferrarimodel, which combines an expansion in the Yang-Mills coupling and in theinverse number of colors, without expanding in the quark-gluon coupling. Theexpansion allows for a consistent treatment of ultraviolet tails viarenormalization group techniques. At leading order, it leads to the resummationof rainbow diagrams for the quark propagator, with, however, a trivial runningof both the gluon mass and the quark-gluon coupling. In a previous work, byusing a simple model for a more realistic running of these parameters, we couldreproduce the known phenomenology of chiral symmetry breaking, including asatisfactory description of the lattice data for the quark mass function. Here,we get rid of this model-dependence by taking our approximation scheme tonext-to-leading order. This allows us to consistently include the realisticrunning of the parameters and to access the unquenched gluon and ghostpropagators to first nontrivial order, which we can compare to availablelattice data for an even more stringent test of our approach. In particular,our results for the various two-point functions compare well with lattice datawhile the parameters of the model are strongly constrained.

Spontaneous chiral symmetry breaking in the massive Landau gauge: realistic running coupling