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Gluon mass generation without seagull divergences

AutorPapavassiliou, Joannis ; Aguilar, Arlene Cristina
Fecha de publicación1-feb-2010
EditorAmerican Physical Society
CitaciónPhysical Review - Section D - Particles and Fields 81 (3): 034003 (2010)
ResumenDynamical gluon mass generation has been traditionally plagued with seagull divergences, and all regularization procedures proposed over the years yield finite but scheme-dependent gluon masses. In this work we show how such divergences can be eliminated completely by virtue of a characteristic identity, valid in dimensional regularization. The ability to trigger the aforementioned identity hinges crucially on the particular Ansatz employed for the three-gluon vertex entering into the Schwinger-Dyson equation governing the gluon propagator. The use of the appropriate three-gluon vertex brings about an additional advantage: one obtains two separate (but coupled) integral equations, one for the effective charge and one for the gluon mass. This system of integral equations has a unique solution, which unambiguously determines these two quantities. Most notably, the effective charge freezes in the infrared, and the gluon mass displays power-law running in the ultraviolet, in agreement with earlier considerations.
Versión del editorhttp://dx.doi.org/ 10.1103/PhysRevD.81.034003
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