Masses of the 70- Baryons in Large Nc QCD

C. L. Schat; J. L. Goity; N. N. Scoccola

Masses of the 70- Baryons in Large Nc QCD

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arxiv hep-ph/0111082 v2 pith:LGNQSGYW submitted 2001-11-07 hep-ph

C. L. Schat , J. L. Goity , N. N. Scoccola This is my paper

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keywords breakingorderbaryonsfoundlambdalargemassessymmetry

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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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