Infrared finite ghost propagator in the Feynman gauge
| dc.creator | Aguilar, A. C. | |
| dc.creator | Papavassiliou, J. | |
| dc.date | 2007-12-05 | |
| dc.date.accessioned | 2026-07-07T11:39:11Z | |
| dc.date.available | 2026-07-07T11:39:11Z | |
| dc.description | We demonstrate how to obtain from the Schwinger-Dyson equations of QCD an infrared finite ghost propagator in the Feynman gauge. The key ingredient in this construction is the longitudinal form factor of the non-perturbative gluon-ghost vertex, which, contrary to what happens in the Landau gauge, contributes non-trivially to the gap equation of the ghost. The detailed study of the corresponding vertex equation reveals that in the presence of a dynamical infrared cutoff this form factor remains finite in the limit of vanishing ghost momentum. This, in turn, allows the ghost self-energy to reach a finite value in the infrared, without having to assume any additional properties for the gluon-ghost vertex, such as the presence of massless poles. The implications of this result and possible future directions are briefly outlined. | |
| dc.description | 22 pages, 9 figures | |
| dc.identifier | https://arxiv.org/abs/0712.0780 | |
| dc.identifier | http://arxiv.org/abs/0712.0780 | |
| dc.identifier | Phys.Rev.D77:125022,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.77.125022 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/199828 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Infrared finite ghost propagator in the Feynman gauge | |
| dc.type | text |