Negative parity pentaquarks in large N{sub c} QCD and quark model
- Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
- CONICET and Department of Physics, Comision Nacional de Energia Atomica, Avenida Libertador 8250 (1429) Buenos Aires (Argentina)
Recently, the 1/N{sub c} expansion has been applied to the study of exotic baryons containing both quarks and antiquarks. We extend this approach to exotic states with mixed-symmetric spin-flavor symmetry, which correspond in the quark model to negative parity pentaquarks, and discuss the large N{sub c} predictions for their mass spectrum. The heavy exotics Qq{sup 4} transform as 3,6,15 and 15{sup '} under SU(3), while the light states qq{sup 4} include the exotic multiplets 10,27,35. We give mass relations among these multiplets in the 1/N{sub c} expansion. In the quark model, the mass splittings between these states are given by color-spin interactions. Using the observation of an anticharmed exotic by the H1 Collaboration, we give predictions for the masses of other expected heavy pentaquarks.
- OSTI ID:
- 20705973
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 3; Other Information: DOI: 10.1103/PhysRevD.71.036004; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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