The mass spectrum of the positive parity [56,2+] baryons is studied in the 1/Nc expansion up to and including O(1/Nc) effects with SU(3) symmetry breaking implemented to first order. A total of eighteen mass relations result, several of which are tested with the available data. The breaking of spin-flavor symmetry is dominated by the hyperfine interactions, while spin–orbit effects are found to be small.
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Goity et al. (2003) studied this question.
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