Pseudoscalar qqbar mesons and effective QCD coupling enhanced by <A^2> condensate

Details Pseudoscalar qqbar mesons and effective QCD coupling enhanced by <A^2> condensate Pseudoscalar qqbar mesons and effective QCD coupling enhanced by <A^2> condensate

2003-07-08

arxiv.org/abs/hep-ph/0307110v2

Phys.Rev. D71 (2005) 014004

Physics

High Energy Physics

High Energy Physics - Phenomenology

revtex4, 4 eps figures, 8 pages, improved presentation, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.71.014004

Recent developments provided evidence that the dimension 2 gluon condensate 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 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.

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