%0 Journal Article
%T Goldstone Theorem and Diquark Confinement Beyond Rainbow-Ladder Approximation
%A A. Bender
%A C. D. Roberts
%A L. v. Smekal
%J Physics
%D 1996
%I arXiv
%R 10.1016/0370-2693(96)00372-3
%X The quark Dyson-Schwinger equation and meson Bethe-Salpeter equation are studied in a truncation scheme that extends the rainbow-ladder approximation such that, in the chiral limit, the isovector, pseudoscalar meson remains massless. Quark-quark (diquark) correlations, which are bound in rainbow-ladder approximation, are destabilised by repulsive contributions that only appear at higher order in the Bethe-Salpeter kernel. The net effect of higher order terms on the meson bound-state masses is small.
%U http://arxiv.org/abs/nucl-th/9602012v1