Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1996-05-17
Phys.Rev.C55:2649-2664,1997
Physics
Nuclear Physics
Nuclear Theory
30 pages, LaTeX/REVTEX 3.0, no figures
Scientific paper
10.1103/PhysRevC.55.2649
A confining, Goldstone theorem preserving, separable Ansatz for the ladder kernel of the two-body Bethe-Salpeter equation is constructed from phenomenologically efficacious $u$, $d$ and $s$ dressed-quark propagators. The simplicity of the approach is its merit. It provides a good description of the ground-state isovector-pseudoscalar, vector and axial-vector meson spectrum; facilitates an exploration of the relative importance of various components of the two-body Bethe-Salpeter amplitudes, showing that sub-leading Dirac components are quantitatively important in the isovector-pseudoscalar meson channels; and allows a scrutiny of the domain of applicability of ladder truncation studies. A colour-antitriplet diquark spectrum is obtained. Shortcomings of separable Ans\"atze and the ladder kernel are highlighted.
Burden Conrad J.
Qian Lu
Roberts Christopher D.
Tandy Peter. C.
Thomson Michael J.
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