2005/10/27 by Huey-Wen Lin · 1 citation
Mathematics · Physics and Astronomy · #Algorithm #Combinatorics #Fermion #Gluon #High-Energy Particle Collisions Research #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Vertex (graph theory) #Vertex function #hep-lat
paper · pdf · doi:10.1103/physrevd.73.094511
published as Phys.Rev. D73 (2006) 094511 · 11 pages, 13 figures, REVTeX 4
arxiv created 2005/10/27 · openalex publication_date 2006/05/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We perform a study of 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 nonperturbatively 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 cSW 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 cq^\ensuremath'.