Masses of the 70- Baryons in Large Nc QCD

Details Masses of the 70- Baryons in Large Nc QCD Masses of the 70- Baryons in Large Nc QCD

2001-11-07

arxiv.org/abs/hep-ph/0111082v2

Phys.Rev.Lett. 88 (2002) 102002

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages; references were added and a couple of improvements to the text were made

Scientific paper

10.1103/PhysRevLett.88.102002

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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