Charmonium radiative transitions, meson and glueball particle properties with the effective strong coupling
1 Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna 141980, Russia
2 Institute of Physics and Technology, Ulaanbaatar 13330, Mongolia
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Published online: 3 April 2019
The particle properties of conventional mesons and scalar glueball, radiative transitions of charmonium excited states χcJ (J = 0, 1, 2) are studied in the framework of relativistic quark models with infrared confinement by taking into account the mass dependence of the effective strong coupling. A specific behaviour of the mass-dependent strong coupling with a freezing point αs (0) = 1.032 has been revealed. The spectrum and leptonic (weak) decay constants of conventional mesons have been calculated in good agreement with the latest experimental data. New estimates on the scalar glueball mass, ’radius’ and gluon condensate value have been obtained. Dominant radiative transitions of the charmonium orbital excitations χcJ → J/ψ + γ have been studied and the partial decay widths have been estimated with reasonable accuracy.
© The Authors, published by EDP Sciences, 2019
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