Publicação: Infrared finite solutions for the gluon propagator and the QCD vacuum energy
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Nonperturbative infrared finite solutions for the gluon polarization tensor have been found, and the possibility that gluons may have a dynamically generated mass is supported by recent Monte Carlo simulation on the lattice. These solutions differ among themselves, due to different approximations performed when solving the Schwinger-Dyson equations for the gluon polarization tensor. Only approximations that minimize energy are meaningful, and, according to this, we compute an effective potential for composite operators as a function of these solutions in order to distinguish which one is selected by the vacuum. © 1997 Elsevier Science B.V.
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 406, n. 1-2, p. 130-136, 1997.
