%0 Journal Article
%T Diquarks: condensation without bound states
%A J. C. R. Bloch
%A C. D. Roberts
%A S. M. Schmidt
%J Physics
%D 1999
%I arXiv
%R 10.1103/PhysRevC.60.065208
%X We employ a bispinor gap equation to study superfluidity at nonzero chemical potential: mu .neq. 0, in two- and three-colour QCD. The two-colour theory, QC2D, is an excellent exemplar: the order of truncation of the quark-quark scattering kernel: K, has no qualitative impact, which allows a straightforward elucidation of the effects of mu when the coupling is strong. In rainbow-ladder truncation, diquark bound states appear in the spectrum of the three-colour theory, a defect that is eliminated by an improvement of K. The corrected gap equation describes a superfluid phase that is semi-quantitatively similar to that obtained using the rainbow truncation. A model study suggests that the width of the superfluid gap and the transition point in QC2D provide reliable quantitative estimates of those quantities in QCD.
%U http://arxiv.org/abs/nucl-th/9907086v1