Phys. Rev. Lett. 88, 102002 (2002) [4 pages]Masses of the 70- Baryons in Large Nc QCD |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1984: |
C. L. Schat1,2, J. L. Goity1,2, and N. N. Scoccola3,4
1Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606
2Department of Physics, Hampton University, Hampton, Virginia 23668
3Physics Department, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, (1429) Buenos Aires, Argentina
4Universidad Favaloro, Solís 453, (1078) Buenos Aires, Argentina
Received 7 November 2001; published 25 February 2002
The masses of the negative parity 70-plet baryons are analyzed in large Nc QCD to order 1/Nc and to first order in SU(3) symmetry breaking. The existing experimental data are well reproduced and 20 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/Nc hyperfine interaction is the dominant source of the breaking. It is found that the Λ(1405) and Λ(1520) are well described as three-quark states and spin-orbit partners. New relations between splittings in different SU(3) multiplets are found.
©2002 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v88/e102002
DOI: 10.1103/PhysRevLett.88.102002
PACS: 14.20.Jn, 11.15.Pg, 12.39.Jh, 12.40.Yx
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