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Effective gluon mass and infrared fixed point in QCD

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	Aguilar, Arlene Cristina; Papavassiliou, Joannis
	This document is a artículoDate2007
	Este documento está disponible también en : http://hdl.handle.net/10550/43266
	We report on a special type of solutions for the gluon propagator of pure QCD, obtained from the corresponding non-linear Schwinger-Dyson equation formulated in the Feynman gauge of the background field method. These solutions reach a finite value in the deep infrared and may be fitted using a massive propagator, with the crucial characteristic that the effective ``mass'' employed depends on the momentum transfer. Specifically, the gluon mass falls off as the inverse square of the momentum, as expected from the operator-product expansion. In addition, one may define a dimensionless quantity, which constitutes the generalization in a non-Abelian context of the universal QED effective charge. This strong effective charge displays asymptotic freedom in the ultraviolet whereas in the low-energy regime it freezes at a finite value, giving rise to an infrared fixed point for QCD.
	Aguilar, Arlene Cristina Papavassiliou, Joannis 2007 Effective gluon mass and infrared fixed point in QCD AIP Conference Proceedings 964 312 317
	http://dx.doi.org/10.1063/1.2823869