Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Dynamics and Heavy-Fermion Formalism in Nuclei: I. Exchange Axial
  Currents   Chiral perturbation theory in heavy-fermion formalism is developed for
meson-exchange currents in nuclei and applied to nuclear axial- charge
transitions. Calculation is performed to the next-to-leading order in chiral
expansion which involves graphs up to one loop. The result turns out to be very
simple. The previously conjectured notion of "chiral filter mechanism" in the
time component of the nuclear axial current and the space component of the
nuclear electromagnetic current is verified to that order. As a consequence,
the phenomenologically observed soft-pion dominance in the nuclear process is
given a simple interpretation in terms of chiral symmetry in nuclei. In this
paper, we focus on the axial current, relegating the EM current which can be
treated in a similar way to a separate paper. We discuss the implication of our
result on the enhanced axial-charge transitions observed in heavy nuclei and
clarify the relationship between the phenomenological meson-exchange
description and the chiral Lagrangian description.

25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom