Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon Properties in the Perturbative Chiral Quark Model   We apply the perturbative chiral quark model (PCQM) to analyse low-energy
nucleon properties: electromagnetic form factors, meson-nucleon sigma-terms and
pion-nucleon scattering. Baryons are described as bound states of valence
quarks surrounded by a cloud of Goldstone bosons (pi, K, eta) as required by
chiral symmetry. The model is based on the following guide lines: chiral
symmetry constraints, fulfilment of low-energy theorems and proper treatment of
sea-quarks, that is meson cloud contributions. Analytic expressions for nucleon
observables are obtained in terms of fundamental parameters of low-energy
pion-nucleon physics (weak pion decay constant, axial nucleon coupling
constant, strong pion-nucleon form factor) and of only one model parameter
(radius of the nucleonic three-quark core). Our results are in good agreement
with experimental data and results of other theoretical approaches.

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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con