Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-10-27
Phys.Rev. D73 (2006) 094511
Physics
High Energy Physics
High Energy Physics - Lattice
11 pages, 13 figures, REVTeX 4
Scientific paper
10.1103/PhysRevD.73.094511
We perform a study the quark-gluon vertex function with a quenched Wilson gauge action and a variety of fermion actions. These include the domain wall fermion action (with exponentially accurate chiral symmetry) and the Wilson clover action both with the non-perturbatively improved clover coefficient as well as with a number of different values for this coefficient. We find that the domain wall vertex function behaves very well in the large momentum transfer region. The off-shell vertex function for the on-shell improved clover class of actions does not behave as well as the domain wall case and, surprisingly, shows only a weak dependence on the clover coefficient $c_{SW}$ for all components of its Dirac decomposition and across all momenta. Including off-shell improvement rotations for the clover fields can make this action yield results consistent with those from the domain wall approach, as well as helping to determine the off-shell improved coefficient $c_q^\prime$.
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