Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $q^2$-Dependence of Meson Mixing in Few-Body Charge Symmetry Breaking:
  $\pi^o-\eta$ Mixing to One Loop in Chiral Perturbation Theory   It is pointed out that the meson mixing matrix elements usually considered
responsible for the bulk of the observed few-body charge symmetry breaking are
naturally $q^2$-dependent in QCD. For $\pi^o-\eta$ mixing, using the usual
representation of the pseudoscalar fields, the leading $q^2$ dependence can be
explicitly calculated using chiral perturbation theory to one loop, the result
being a significant decrease in the magnitude of the matrix element in going
from timelike to spacelike values of $q^2$. Since it is the latter range of
$q^2$ which is relevant to NN scattering and the few-body bound state, this
result calls into serious question the standard treatment of few-body charge
symmetry breaking contributions associated with $\pi^o-\eta$ and $\rho -\omega$
mixing.

23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph