Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The A5 and the pion field   In this talk, an SU(Nf)xSU(Nf)Yang-Mills model with a compact extra-dimension
is used to describe the spin-1 mesons and pions of massless QCD in the
large-Nc. The right 4D symmetry and symmetry-breaking pattern is produced by
imposing appropriate boundary conditions. The Goldstone boson fields are
constructed using a Wilson line. We derive the low-energy limit (chiral
lagrangian), discuss rho-meson dominance, sum rules between resonance couplings
and the relation with the QCD high-energy behavior. Finally, we provide an
analytic expression for the two-point function of vector and axial currents.

37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph