Quark-gluon vertex and structure of mesons and diquarks

Preprint

25 June 1993

preprint
Published by arXiv in arXiv

Abstract

*REVISED VERSION* Two quark propagators with different analytic structure are employed in on and off mass-shell Bethe-Salpeter type equations for the pion and scalar diquark form-factors. One of the quark propagators has been calculated with the inclusion of a trivial quark-gluon vertex and, as a consequence, contains a complex conjugate pair of logarithmic branch points. The other quark propagator includes a non-trivial vertex ansatz and is entire, with an essential singularity at infinity. The different quark propagators lead to qualitatively different diquark form-factors.

Keywords

QUARK GLUON VERTEX
QUARK PROPAGATORS
BRANCH POINTS
QUALITATIVELY
DIQUARK
VERTEX

All Related Versions

Version 1, 1993-06-25, ArXiv
Version 2, 1993-09-10, ArXiv
Published version: Modern Physics Letters A, 09 (38), 3551.

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