https://doi.org/10.1140/epja/s10050-025-01607-4
Regular Article - Theoretical Physics
Bottomonium meson spectrum with quenched and unquenched quark models
1
School of Physics, Nankai University, 300071, Tianjin, China
2
Centre For High Energy Physics, University of the Punjab, 54590, Lahore, Pakistan
3
Department of Physics and Astronomy, University of Pittsburgh, 15260, Pittsburgh, PA, USA
4
School of Physics, Henan University of Technology, 450001, Zhengzhou, Henan, China
Received:
17
March
2025
Accepted:
30
May
2025
Published online:
17
June
2025
An open question in hadronic phenomenology concerns the “unquenching” effects of higher Fock space components on the leading Fock space description of hadrons. We address this by making a comparison of the bottomonium spectrum as computed with the relativized Godfrey–Isgur quark model and an unquenched coupled channel model driven by the “
” mechanism of hadronic decay. Our results show that both models can describe the spectrum well, indicating that the influence of coupled channel effects can be largely absorbed into the parameters of the quenched quark model. This conclusion is reinforced by a perturbative calculation that shows that the spin-dependence of mass splittings due to mixing with the continuum recapitulates quenched quark model spin-dependent interactions. We also show that softening of the quark-antiquark wavefunction due to continuum mixing improves the description of vector bottomonium decay constants. Together, these results illustrate and substantiate the surprising robustness of simple constituent quark model descriptions of hadrons.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
