Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Symmetry: Pion-Nucleon Interactions in Constituent Quark Models   We study the interactions of an elementary pion with a nucleon made of
constituent quarks and show that the enforcement of chiral symmetry requires
the use of a two-body operator, whose form does not depend on the choice of the
pion-quark coupling. The coordinate space NN effective potential in the pion
exchange channel is given as a sum of terms involving two gradients, that
operate on both the usual Yukawa function and the confining potential. We also
consider an application to the case of quarks bound by a harmonic potential and
show that corrections due to the symmetry are important.

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The categories of this paper are: supr-con
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio