Gauge theories such as Quantum Chromodynamics (QCD) present the phenomenon of dynamical mass generation. It occurs both in quarks and gluons mass generation, and, though less known in the latter case, recent lattice results on pure QCD show that this possibility seems to be indeed realized in Nature. The fact that the gluon presents a dynamical mass introduces in the theory a natural infrared cutoff, whose introduction in perturbative QCD calculations has been satisfyingly implemented by our group in tree-level processes. This project is divided into various topics of QCD phenomenology, always including the effect of the gluon's dynamical mass. One of these subjects is the problem of chiral symmetry breaking in the presence of massive gluons, a matter of recent development which modified the usual ideas concerning it. Other topic is the consideration of massive gluons at the loop level, that is, it is intended to deal with an improved perturbative approach, introducing dressed propagators and vertices, as an application of the pinch technique to an evolution of the dynamical perturbation theory proposed by Pagels and Stokar many years ago.
News published in Agência FAPESP Newsletter about the scholarship: