Abstract
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.
Highlights
In modern particle physics one deals with a number of phenomena such as the quark confinement, running strong coupling, generation of hadron mass etc., which require correct description of hadron dynamics in the low-energy domain within theoretical models
QCD predicts a dependence of the physical strong coupling under changes of energy scale Q
The low-energy behavior of αs has not been well defined yet, it needs to be more specified, because many quantities in particle physics are affected by the IR behavior of αs
Summary
In modern particle physics one deals with a number of phenomena such as the quark confinement, running strong coupling, generation of hadron mass etc., which require correct description of hadron dynamics in the low-energy domain within theoretical models. QCD predicts a dependence of the physical strong coupling under changes of energy (or, mass) scale Q. This dependence αs(Q) g2/(4π) is determined well in experiments at relatively high energies [1]. The correct description of QCD effective coupling in the IR regime remains one of the important problems. Our study is based on the formalism of analytic (infrared) confinement principle [3] and the Covariant Confined Quark Model (CCQM) [4]
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