The dynamical diquark model: fine structure and isospin
Abstract We incorporate fine-structure corrections into the dynamical diquark model of multiquark exotic hadrons. These improvements include effects due to finite diquark size, spin-spin couplings within the diquarks, and most significantly, isospin-dependent couplings in the form of pionlike exchan...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-01-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP01(2020)124 |
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| author | Jesse F. Giron Richard F. Lebed Curtis T. Peterson |
| author_facet | Jesse F. Giron Richard F. Lebed Curtis T. Peterson |
| author_sort | Jesse F. Giron |
| collection | DOAJ |
| description | Abstract We incorporate fine-structure corrections into the dynamical diquark model of multiquark exotic hadrons. These improvements include effects due to finite diquark size, spin-spin couplings within the diquarks, and most significantly, isospin-dependent couplings in the form of pionlike exchanges assumed to occur between the light quarks within the diquarks. Using a simplified two-parameter interaction Hamiltonian, we obtain fits in which the isoscalar JPC = 1++ state — identified as the X (3872) — appears naturally as the lightest exotic (including all states that are predicted by the model but have not yet been observed), while the closed-charm decays of Zc(3900) and Zc(4020) prefer J/𝜓 and hc modes, respectively, in accord with experiment. We explore implications of this model for the excited tetraquark multiplets and the pentaquarks. |
| format | Article |
| id | doaj-art-d0f2d8afb28748c18530881756071b2e |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-d0f2d8afb28748c18530881756071b2e2025-01-26T12:11:29ZengSpringerOpenJournal of High Energy Physics1029-84792020-01-012020112210.1007/JHEP01(2020)124The dynamical diquark model: fine structure and isospinJesse F. Giron0Richard F. Lebed1Curtis T. Peterson2Department of Physics, Arizona State UniversityDepartment of Physics, Arizona State UniversityDepartment of Physics, Arizona State UniversityAbstract We incorporate fine-structure corrections into the dynamical diquark model of multiquark exotic hadrons. These improvements include effects due to finite diquark size, spin-spin couplings within the diquarks, and most significantly, isospin-dependent couplings in the form of pionlike exchanges assumed to occur between the light quarks within the diquarks. Using a simplified two-parameter interaction Hamiltonian, we obtain fits in which the isoscalar JPC = 1++ state — identified as the X (3872) — appears naturally as the lightest exotic (including all states that are predicted by the model but have not yet been observed), while the closed-charm decays of Zc(3900) and Zc(4020) prefer J/𝜓 and hc modes, respectively, in accord with experiment. We explore implications of this model for the excited tetraquark multiplets and the pentaquarks.https://doi.org/10.1007/JHEP01(2020)124Phenomenological ModelsQCD Phenomenology |
| spellingShingle | Jesse F. Giron Richard F. Lebed Curtis T. Peterson The dynamical diquark model: fine structure and isospin Journal of High Energy Physics Phenomenological Models QCD Phenomenology |
| title | The dynamical diquark model: fine structure and isospin |
| title_full | The dynamical diquark model: fine structure and isospin |
| title_fullStr | The dynamical diquark model: fine structure and isospin |
| title_full_unstemmed | The dynamical diquark model: fine structure and isospin |
| title_short | The dynamical diquark model: fine structure and isospin |
| title_sort | dynamical diquark model fine structure and isospin |
| topic | Phenomenological Models QCD Phenomenology |
| url | https://doi.org/10.1007/JHEP01(2020)124 |
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