Heavyandquarkonium states and unitarity effects
- 1 January 1984
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 29 (1), 110-120
- https://doi.org/10.1103/physrevd.29.110
Abstract
We construct a unitarized quarkonium model which uses the quark-pair-creation model for hadronic vertex functions. The mass shifts and mixings induced by , , , etc., loop diagrams are calculated. These improve in particular the fit to the resonances such as and which are strongly affected by the first threshold. When comparing the leptonic widths with experiment the unitarized model gives considerably better agreement compared to single-channel potential models. The improvement is partly because of the mixing between different excitations induced by hadronic loops, and partly because of the fact that the wave functions (at the origin) are modified compared to nonunitarized models.
Keywords
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