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Pirjol, D.; Schat, C. "Positive parity pentaquark towers in large Nc QCD" (2007) Physical Review D - Particles, Fields, Gravitation and Cosmology. 75(7)
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Abstract:

We construct the complete set of positive parity pentaquarks, which correspond in the quark model to s̄qNc+1 states with one unit of orbital angular momentum L=1. In the large Nc limit they fall into the K=1/2 and K=3/2 irreps (towers) of the contracted SU(4)c symmetry. We derive predictions for the mass spectrum and the axial couplings of these states at leading order in 1/Nc. The strong decay width of the lowest-lying positive parity exotic state is of order O(1/Nc), such that this state is narrow in the large Nc limit. Replacing the antiquark with a heavy antiquark Q̄qNc+1, the two towers become degenerate, split only by O(1/mQ) hyperfine interactions. We obtain predictions for the strong decay widths of heavy pentaquarks to ordinary baryons and heavy HQ̄(*) mesons at leading order in 1/Nc and 1/mQ. © 2007 The American Physical Society.

Registro:

Documento: Artículo
Título:Positive parity pentaquark towers in large Nc QCD
Autor:Pirjol, D.; Schat, C.
Filiación:Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
CONICET, Departamento de Física, Pab.1, (1428) Buenos Aires, Argentina
Departamento de Física, Universidad de Murcia, E-30071 Murcia, Spain
Año:2007
Volumen:75
Número:7
DOI: http://dx.doi.org/10.1103/PhysRevD.75.076004
Título revista:Physical Review D - Particles, Fields, Gravitation and Cosmology
Título revista abreviado:Phys Rev D Part Fields Gravit Cosmol
ISSN:15507998
CODEN:PRVDA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v75_n7_p_Pirjol

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Citas:

---------- APA ----------
Pirjol, D. & Schat, C. (2007) . Positive parity pentaquark towers in large Nc QCD. Physical Review D - Particles, Fields, Gravitation and Cosmology, 75(7).
http://dx.doi.org/10.1103/PhysRevD.75.076004
---------- CHICAGO ----------
Pirjol, D., Schat, C. "Positive parity pentaquark towers in large Nc QCD" . Physical Review D - Particles, Fields, Gravitation and Cosmology 75, no. 7 (2007).
http://dx.doi.org/10.1103/PhysRevD.75.076004
---------- MLA ----------
Pirjol, D., Schat, C. "Positive parity pentaquark towers in large Nc QCD" . Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 75, no. 7, 2007.
http://dx.doi.org/10.1103/PhysRevD.75.076004
---------- VANCOUVER ----------
Pirjol, D., Schat, C. Positive parity pentaquark towers in large Nc QCD. Phys Rev D Part Fields Gravit Cosmol. 2007;75(7).
http://dx.doi.org/10.1103/PhysRevD.75.076004