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Semiperturbative construction for the quark-gluon vertex | | Felipe J. Llanes-Estrada
; Christian S. Fischer
; Reinhard Alkofer
; | | Date: |
29 Jul 2004 | | Subject: | hep-ph | | Affiliation: | Complutense Madrid), Christian S. Fischer (IPPP Durham), Reinhard Alkofer (Tubingen | | Abstract: | We construct a model for the quark-gluon vertex of Landau gauge QCD. This is of twofold interest: on the one hand the quark-gluon interaction is at the heart of quark confinement, on the other hand it is a central element in hadron phenomenology based on QCD Greens functions. We employ the non-Abelian one-loop diagram in perturbation theory, which is of order Nc. As a novelty we replace the tree-level quark and gluon propagators in this diagram by their dressed counterparts solving the Dyson-Schwinger equations. The Nc-suppressed Abelian diagram is an order of magnitude smaller in various kinematics. We also study the effect of ghost dressing factors on the vertex obtaining a construction in good agreement with recent low-momentum lattice calculations. | | Source: | arXiv, hep-ph/0407332 | | Services: | Forum | Review | PDF | Favorites | |
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