Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-10-14
PoS LC2008:050,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited talk given at LIGHT CONE 2008 Relativistic Nuclear and Particle Physics, July 7-11 2008 Mulhouse, France
Scientific paper
We show that the gauge invariant treatment of the Schwinger-Dyson equations of QCD leads to an infrared finite gluon propagator, signaling the dynamical generation of an effective gluon mass, and a non-enhanced ghost propagator, in qualitative agreement with recent lattice data. The truncation scheme employed is based on the synergy between the pinch technique and the background field method. One of its most powerful features is that the transversality of the gluon self-energy is manifestly preserved, exactly as dictated by the BRST symmetry of the theory. We then explain, for the first time in the literature, how to construct non-perturbatively a renormalization group invariant quantity out of the conventional gluon propagator. This newly constructed quantity serves as the natural starting point for defining a non-perturbative effective charge for QCD, which constitutes, in all respects, the generalization in a non-Abelian context of the universal QED effective charge. This strong effective charge displays asymptotic freedom in the ultraviolet, while in the low-energy regime it freezes at a finite value, giving rise to an infrared fixed point for QCD. Some possible pitfalls related to the extraction of such an effective charge from infrared finite gluon propagators, such as those found on the lattice, are briefly discussed.
Aguilar Arlene C.
Binosi Daniele
Papavassiliou Joannis
No associations
LandOfFree
Infrared finite effective charge of QCD does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Infrared finite effective charge of QCD, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared finite effective charge of QCD will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-590515