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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Publicado: 2007
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v75_n7_p_Pirjol
http://hdl.handle.net/20.500.12110/paper_15507998_v75_n7_p_Pirjol
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_15507998_v75_n7_p_Pirjol
record_format dspace
spelling paper:paper_15507998_v75_n7_p_Pirjol2023-06-08T16:22:01Z 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 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. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v75_n7_p_Pirjol 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
collection 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.
title Positive parity pentaquark towers in large Nc QCD
spellingShingle 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
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v75_n7_p_Pirjol
http://hdl.handle.net/20.500.12110/paper_15507998_v75_n7_p_Pirjol
_version_ 1768544839490600960

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