Positive parity pentaquark towers in large Nc QCD

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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...

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Autor principal: Pirjol, D.
Otros Autores: Schat, C.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2007
Acceso en línea:Registro en Scopus
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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100 1 |a Pirjol, D. 
245 1 0 |a Positive parity pentaquark towers in large Nc QCD 
260 |c 2007 
270 1 0 |m Pirjol, D.; Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States 
506 |2 openaire  |e Política editorial 
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520 3 |a 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.  |l eng 
593 |a Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States 
593 |a CONICET, Departamento de Física, Pab.1, (1428) Buenos Aires, Argentina 
593 |a Departamento de Física, Universidad de Murcia, E-30071 Murcia, Spain 
700 1 |a Schat, C. 
773 0 |d 2007  |g v. 75  |k n. 7  |p Phys Rev D Part Fields Gravit Cosmol  |x 15507998  |t Physical Review D - Particles, Fields, Gravitation and Cosmology 
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856 4 0 |u https://doi.org/10.1103/PhysRevD.75.076004  |y DOI 
856 4 0 |u https://hdl.handle.net/20.500.12110/paper_15507998_v75_n7_p_Pirjol  |y Handle 
856 4 0 |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v75_n7_p_Pirjol  |y Registro en la Biblioteca Digital 
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