Threshold effects in heavy quarkonium spectroscopy
| Autor: | Ferretti, J. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.5124595 |
| Popis: | In this contribution, we discuss the possible importance of continuum-coupling (or threshold) effects in heavy quarkonium spectroscopy. Our calculations are carried out in a coupled-channel model, where meson-meson higher Fock (or molecular-type) components are introduced in $Q \bar Q$ bare meson wave functions by means of a pair-creation mechanism. After providing a quick resume of the main characteristics of the coupled-channel model, we briefly discuss its application to the calculation of the masses of heavy quarkonium-like $\chi_{\rm c}(2P)$ and $\chi_{\rm b}(3P)$ states with threshold corrections. We show that the introduction of pair-creation effects in the Quark Model (QM) formalism makes it possible to explain the deviations of $\chi_{\rm c}(2P)$ states' masses from the experimental data, without affecting the good QM description of the properties of $\chi_{\rm b}(3P)$ states. Comment: Proceedings of the Symposium "Symmetries and Order: Algebraic Methods in Many Body Systems" in honor of Professor Francesco Iachello on the occasion of his retirement, October 5-6 2018, Yale University |
| Databáze: | arXiv |
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