Positive parity pentaquark towers in large Nc QCD
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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_15507998_v75_n7_p_Pirjol |
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todo:paper_15507998_v75_n7_p_Pirjol2023-10-03T16:24:03Z Positive parity pentaquark towers in large Nc QCD Pirjol, D. Schat, C. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15507998_v75_n7_p_Pirjol |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
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. |
| format |
JOUR |
| author |
Pirjol, D. Schat, C. |
| spellingShingle |
Pirjol, D. Schat, C. Positive parity pentaquark towers in large Nc QCD |
| author_facet |
Pirjol, D. Schat, C. |
| author_sort |
Pirjol, D. |
| title |
Positive parity pentaquark towers in large Nc QCD |
| title_short |
Positive parity pentaquark towers in large Nc QCD |
| title_full |
Positive parity pentaquark towers in large Nc QCD |
| title_fullStr |
Positive parity pentaquark towers in large Nc QCD |
| title_full_unstemmed |
Positive parity pentaquark towers in large Nc QCD |
| title_sort |
positive parity pentaquark towers in large nc qcd |
| url |
http://hdl.handle.net/20.500.12110/paper_15507998_v75_n7_p_Pirjol |
| work_keys_str_mv |
AT pirjold positiveparitypentaquarktowersinlargencqcd AT schatc positiveparitypentaquarktowersinlargencqcd |
| _version_ |
1782027586221637632 |