Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Confining Bethe--Salpeter equation in QCD   We derive a confining $ q \bar{q}$ Bethe--Salpeter equation starting from the
same assumptions on the Wilson loop integral already adopted in the derivation
of a semirelativistic heavy quark potential. We show that, by standard
approximations, an effective meson squared mass operator can be obtained from
our BS kernel and that, from this, by ${1\over m^2}$ expansion, the
corresponding Wilson loop potential is recovered, spin--dependent and
velocity--dependent terms included. We also show, that, on the contrary,
neglecting spin--dependent terms, relativistic flux tube model is reproduced.

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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn