Positive parity pentaquark towers in large Nc QCD
| dc.creator | Pirjol, Dan | |
| dc.creator | Schat, Carlos | |
| dc.date | 2006-12-22 | |
| dc.date.accessioned | 2026-07-07T11:02:28Z | |
| dc.date.available | 2026-07-07T11:02:28Z | |
| dc.description | We construct the complete set of positive parity pentaquarks, which correspond in the quark model to {\bar s} q^{Nc+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 {\bar Q} q^{Nc+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 H(*)_{\bar Q} mesons at leading order in 1/Nc and 1/mQ. | |
| dc.description | 21 pages, 2 figures, 5 tables | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0612314 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0612314 | |
| dc.identifier | Phys.Rev.D75:076004,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.75.076004 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/188261 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Positive parity pentaquark towers in large Nc QCD | |
| dc.type | text |