Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dressed-quarks and the nucleon's axial charge   The nucleon's axial charge, g_A, expresses features that are both fundamental
to the strong interaction and crucial to its connection with weak interaction
physics. We show that dynamical chiral symmetry breaking (DCSB) suppresses the
axial-charge of a dressed-quark, g_A^q, at infrared momenta. Since this effect
disappears as chiral symmetry is restored, one may argue that g_A vanishes with
the restoration of chiral symmetry because no nucleon bound-state survives the
associated transition. The suppression of g_A^q is shown to be part of an
explanation for a 25% reduction of g_A from its nonrelativistic quark-model
value. Critical too, however, is the presence of dressed-quark angular momentum
within the nucleon. The value of g_A^q depends on the kernels of the gap and
Bethe-Salpeter equations. We find that incorporation of essentially
nonperturbative effects associated with DCSB into these kernels inflates the
value relative to that obtained at leading-order in a widely used truncation of
QCD's Dyson-Schwinger equations. Such corrections also affect the nucleon's
axial radius. In both cases, however, agreement with experiment will require
similar improvements to the Faddeev kernel and associated interaction current.

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The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn