Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the $Θ^{+}$ pentaquark
| dc.creator | Yang, Ghil-Seok | |
| dc.creator | Kim, Hyun-Chul | |
| dc.creator | Goeke, Klaus | |
| dc.date | 2007-01-20 | |
| dc.date | 2007-04-19 | |
| dc.date.accessioned | 2026-07-07T10:22:17Z | |
| dc.date.available | 2026-07-07T10:22:17Z | |
| dc.description | Using the exisiting experimental data for hyperon semileptonic decays and the flavor-singlet axial-vector charge $g_{A}^{(0)}$ from polarized deep inelastic scattering of the proton, we derive the decay width of the $Θ^{+}$ pentaquark baryon. We take into account the effects of flavor SU(3) symmetry breaking within the framework of the chiral quark-soliton model. All dynamical parameters of the model are fixed by using the five experimental hyperon semileptonic decay constants and flavor singlet axial-vector charge. We obtain the numerical results of the decay width of the $Θ^{+}$ pentaquark baryon as a function of the pion-nucleon sigma term $Σ_{πN}$ and investigate the dependence of the decay width of the $Θ^{+}$ on the $g_{A}^{(0)}$, varying the $g_{A}^{(0)}$ within the range of the experimental uncertainty. We demonstrate that the combined values of all known semileptonic decays with the generally accepted value of $g_{A}^{(0)} \approx 0.3$ for the proton are compatible with a small decay width $Γ_{ΘKN}$ of the $Θ^{+}$ pentaquark, i.e. $Γ_{ΘKN} \leq 1$ MeV. | |
| dc.description | 11 pages, 2 figures. Title has been changed, some of the text has been modified, and more references have been added. The final version accepted for publication in Phys. Rev. D | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0701168 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0701168 | |
| dc.identifier | Phys.Rev.D75:094004,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.75.094004 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/175465 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the $Θ^{+}$ pentaquark | |
| dc.type | text |