Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quark-gluon vertex and structure of mesons and diquarks   *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.

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The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin