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Masses of the 70- Baryons in Large Nc QCD

C. L. Schat·J. L. Goity·N. N. Scoccola
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Abstract

The masses of the negative parity 70-plet baryons are analyzed in large N_c QCD to order 1/N_c and to first order in SU(3) symmetry breaking. The existing experimental data are well reproduced and twenty new observables are predicted. The leading order SU(6) spin-flavor symmetry breaking is small and, as it occurs in the quark model, the subleading in 1/N_c hyperfine interaction is the dominant source of the breaking. It is found that the Lambda(1405) and Lambda(1520) are well described as three-quark states and spin-orbit partners. New relations between splittings in different SU(3) multiplets are found.

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C. L. Schat, J. L. Goity, N. N. Scoccola. 2002-03-27. Masses of the 70- Baryons in Large Nc QCD. https://doi.org/10.1103/physrevlett.88.102002

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