FIZIKA B 13 (2004)  2, 461-476

A BETHE-SALPETER-EQUATION STUDY WITH THE áA²ń - ENHANCED EFFECTIVE QCD COUPLING

DALIBOR KEKEZ^a and DUBRAVKO KLABUČAR^b

^aRuđer Bošković Institute, P.O.B. 180, 10 002 Zagreb, Croatia
^bDepartment of Physics, Faculty of Science, Zagreb University, Bijenička c. 32, 10 000 Zagreb, Croatia

Received 14 October 2003;        Accepted 30 August 2004
Online 14 November 2004

Dyson-Schwinger equations provide an effective approach to physics of strong interactions. To reproduce the hadronic phenomenology well, the Dyson-Schwinger approach in the rainbow-ladder approximation must employ an effective interaction between quarks which is fairly strong at intermediate (Q² ~ 0.5 GeV²) spacelike transferred momenta. We have recently proposed that such an interaction may originate from the dimension-2 gluon condensate áA² ń which has recently attracted much attention. We showed that the resulting effective running coupling leads to the sufficiently strong dynamical chiral symmetry breaking and successful phenomenology, at least in the light sector of pseudoscalar mesons. In the present paper, we give a more detailed investigation of the parameter dependence of these results.

PACS numbers: 11.10.St, 11.30.Qc, 12.38.Lg, 14.40.Aq
UDC 539.12

Keywords: dimension-2 gluon condensate, QCD, Dyson-Schwinger equation, hadronic physics, pseudoscalar mesons

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