RT Journal Article
T1 Semiperturbative construction for the quark-gluon vertex
A1 Llanes Estrada, Felipe José
A1 Fischer, CS
A1 Alkofer, R
AB 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 N-c. 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 N.-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.
PB Elsevier Science Bv
SN 0920-5632
YR 2006
FD 2006-02
LK https://hdl.handle.net/20.500.14352/50839
UL https://hdl.handle.net/20.500.14352/50839
LA eng
NO © 2005 Publish by Elsevier B.V.We thank M. Bhagwat, C. D. Roberts and P. Tandy for valuable discussions. The lattice data in figure 2 are a courtesy of the authors of [7]. F. L. E. thanks the hospitality of the Tiibingen Institute as well as a DAAD stipendium and Univ. Complutense travel grant. Partial support from grants FPA 2000-0956, BFM 2002-01003 (MCYT, Spain), Al 279/3-4, Fi 970/2-1, and GRK683 (DFG, Germany)
NO MCYT, Spain
NO DFG, Germany
DS Docta Complutense
RD 12 abr 2025