Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Momentum Dependence of the $\rho-\omega$ Mixing Amplitude in a
  Hadronic Model   We calculate the momentum dependence of the $\rho-\omega$ mixing amplitude in
a purely hadronic model. The basic assumption of the model is that the mixing
amplitude is generated by $N{\bar{N}}$ loops and thus driven entirely by the
neutron-proton mass difference. The value of the amplitude at the
$\omega$-meson point is expressed in terms of only the $NN\omega$ and the
$NN\rho$ coupling constants. Using values for these couplings constrained by
empirical two-nucleon data we obtain a value for the mixing amplitude in
agreement with experiment. Extending these results to the spacelike region, we
find a $\rho-\omega$ contribution to the NN interaction that is strongly
suppressed and opposite in sign relative to the conventional contribution
obtained from using the constant on-shell value for the mixing amplitude.

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The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics