Speaker
Dr
Gurjav Ganbold
(Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Russia)
Description
The spectroscopy of light- and heavy-quark mesons as well as the lowest-state glueball state are investigated within a relativistic quantum-field model based on analytical confinement. Ladder Bethe-Salpeter-type equations are derived to define the spectra of quark-antiquark and two-gluon bound states. We provide a new analytic estimate of the lowest-state glueball mass and calculate spectra of some light, intermediate and heavy mesons in a wide range of energy scale $\sim 0.1-10$ GeV [1]. The QCD effective coupling $\alpha_s$ is studied by exploiting the conventional meson spectrum. A new, independent and specific infrared-finite behavior of QCD running coupling is found below $\sim 1$~GeV [2]. By introducing only a minimal set of parameters (the quark masses and the confinement scale) we obtain results in reasonable agreement with recent experimental data. We demonstrate that global properties of some low-energy phenomena may be explained reasonably in the framework of a simple relativistic quantum-field model if one guesses correct symmetry structure of the quark-gluon interaction in the confinement region and uses simple forms of propagators in the hadronization regime.
Refs:
[1] G.Ganbold, Phys.Rev., D79, 034034 (2009)
[2] G.Ganbold, Phys.Rev., D81, 094008 (2010)
Primary author
Dr
Gurjav Ganbold
(Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Russia)