Gluons, quarks, and the transition from nonperturbative to perturbative QCD
Abstract
Lattice-based investigations of two fundamental QCD quantities are described, namely the gluon and quark propagators in Landau gauge. We have studied the Landau gauge gluon propagator using a variety of lattices with spacings from a = 0.17 to 0.41 fm. We demonstrate that it is possible to obtain scaling behavior over a very wide range of momenta and lattice spacings and to explore the infinite volume and continuum limits. These results confirm that the Landau gauge gluon propagator is infrared finite. We study the Landau gauge quark propagator in quenched QCD using two forms of the O(a)-improved propagator and we find good agreement between these. The extracted value of the infrared quark mass in the chiral limit is found to be 300 +/- 30 MeV. We conclude that the momentum regime where the transition from nonperturbative to perturbative QCD occurs is Q^2 approx 4GeV^2.
Keywords
Cite
@article{arxiv.hep-ph/0107029,
title = {Gluons, quarks, and the transition from nonperturbative to perturbative QCD},
author = {Anthony G. Williams and Frederic D. R. Bonnet and Patrick O. Bowman and Derek B. Leinweber and Jon Ivar Skullerud and James M. Zanotti},
journal= {arXiv preprint arXiv:hep-ph/0107029},
year = {2017}
}
Comments
8 pages, 6 figures, 1 table. Talk presented by AGW at the Workshop on Lepton Scattering, Hadrons and QCD, March 26-April 5, 2001, CSSM, Adelaide, Australia. To appear in the proceedings