Pseudoscalar qqbar mesons and effective QCD coupling enhanced by (A2) condensate

Scientific paper - Original scientific paper

• Author: Dalibor Kekez
• Author: Dubravko Klabučar
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Recent developments provided evidence that the dimension 2 gluon condensate hA2i 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 (p2- 0:5 GeV2) momenta. It is shown that the gluon condensate hA2i 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.

• Keywords (english): pseudoscalar mesons; QCD coupling
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review D - Particles, Fields, Gravitation and Cosmology
• Numbering: vol. 71, no. 1, 014004
• p-ISSN: 1550-7998
• e-ISSN: 1550-2368
• DOI: https://doi.org/10.1103/PhysRevD.71.014004
• URN:NBN: urn:nbn:hr:217:356875
• Publication: 2005
• Document URL: http://link.aps.org/doi/10.1103/PhysRevD.71.014004
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2005) by the American Physical Society.
• Created on: 2019-10-15 13:04:53