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Radial excitations of mesons and nucleons from QCD sum rules
Within the framework QCD sum rules, we use the least square fitting method to
investigate the first radial excitations of the nucleon and light mesons such
as , , , . The extracted masses of these radial
excitations are consistent with the experimental data. Especially we find that
the decay constant of , which is the the first radial excitation of
, is tiny and strongly suppressed as a consequence of chiral symmetry.Comment: 19 page
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