Nonperturbative structure of the quark-gluon vertex

Details Nonperturbative structure of the quark-gluon vertex Nonperturbative structure of the quark-gluon vertex

2003-03-20

arxiv.org/abs/hep-ph/0303176v1

JHEP 0304:047,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 11 figures, JHEP3.cls

Scientific paper

10.1088/1126-6708/2003/04/047

The complete tensor structure of the quark--gluon vertex in Landau gauge is determined at two kinematical points (`asymmetric' and `symmetric') from lattice QCD in the quenched approximation. The simulations are carried out at beta=6.0, using a mean-field improved Sheikholeslami-Wohlert fermion action, with two quark masses ~ 60 and 115 MeV. We find substantial deviations from the abelian form at the asymmetric point. The mass dependence is found to be negligible. At the symmetric point, the form factor related to the chromomagnetic moment is determined and found to contribute significantly to the infrared interaction strength.

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