Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the flavor mixing by a Light-Cone Hamiltonian and the isotopic spin
  in QCD   The structure of an effective light-cone Hamiltonian as recently derived is
analyzed with emphasis on its prediction for flavor mixing in physical mesons.
In a (perhaps over-simplified) model with one adjustable parameter, the
empirical masses of all 25 pseudo-scalar mesons which are possible for 5
flavors are reproduced (almost) quantitatively. These results are coupled with
explicit numerical estimates of flavor mixing. In the present approach, the
well-known mass degeneracy of the pion triplet is caused by the mass degeneracy
of the up and down quark.

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The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
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The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph