Gluon mass and freezing of the QCD coupling
Abstract
Infrared finite solutions for the gluon propagator of pure QCD are obtained from the gauge-invariant non-linear Schwinger-Dyson equation formulated in the Feynman gauge of the background field method. These solutions may be fitted using a massive propagator, with the special characteristic that the effective mass employed drops asymptotically as the inverse square of the momentum transfer, in agreement with general operator-product expansion arguments. Due to the presence of the dynamical gluon mass the strong effective charge extracted from these solutions freezes at a finite value, giving rise to an infrared fixed point for QCD.
Keywords
Cite
@article{arxiv.0711.0936,
title = {Gluon mass and freezing of the QCD coupling},
author = {A. C. Aguilar and J. Papavassiliou},
journal= {arXiv preprint arXiv:0711.0936},
year = {2008}
}
Comments
3 pages, 2 figures, based on talk given at the 2007 Europhysics Conference on High Energy Physics, Manchester, 19-25 July