Goldstone Theorem and Diquark Confinement Beyond Rainbow-Ladder Approximation

Details Goldstone Theorem and Diquark Confinement Beyond Rainbow-Ladder Approximation Goldstone Theorem and Diquark Confinement Beyond Rainbow-Ladder Approximation

1996-02-07

arxiv.org/abs/nucl-th/9602012v1

Phys.Lett.B380:7-12,1996

Physics

Nuclear Physics

Nuclear Theory

11 pages, LaTeX, elsart.sty, 3 EPS figures

Scientific paper

10.1016/0370-2693(96)00372-3

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.

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