Gluon mass and freezing of the QCD coupling

Details Gluon mass and freezing of the QCD coupling Gluon mass and freezing of the QCD coupling

2007-11-06

arxiv.org/abs/0711.0936v1

J.Phys.Conf.Ser.110:022040,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 2 figures, based on talk given at the 2007 Europhysics Conference on High Energy Physics, Manchester, 19-25 July

Scientific paper

10.1088/1742-6596/110/2/022040

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.

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