Pseudoscalar qqbar mesons and effective QCD coupling enhanced by <A^2> condensate
Abstract
Recent developments provided evidence that the dimension 2 gluon condensate <A^2> is important for the nonperturbative regime of Yang-Mills theories (quantized in the Landau gauge). We show that it may be relevant for the Dyson-Schwinger approach to QCD. In order that this approach leads to a successful hadronic phenomenology, an enhancement of the effective quark-gluon interaction seems to be needed at intermediate (p^2 \sim 0.5 GeV^2) momenta. It is shown that the gluon condensate <A^2> provides such an enhancement. It is also shown that the resulting effective strong running coupling leads to the sufficiently strong dynamical chiral symmetry breaking and successful phenomenology at least in the light sector of pseudoscalar mesons.
Cite
@article{arxiv.hep-ph/0307110,
title = {Pseudoscalar qqbar mesons and effective QCD coupling enhanced by <A^2> condensate},
author = {Dalibor Kekez and Dubravko Klabucar},
journal= {arXiv preprint arXiv:hep-ph/0307110},
year = {2009}
}
Comments
revtex4, 4 eps figures, 8 pages, improved presentation, to appear in Phys. Rev. D