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FIZIKA B 13 (2004) 2, 461-476
 
A BETHE-SALPETER-EQUATION STUDY WITH THE áA2ń - ENHANCED EFFECTIVE QCD COUPLING
DALIBOR KEKEZa and DUBRAVKO KLABUČARb
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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