Jun 13 – 17, 2011
Künstlerhaus
Europe/Berlin timezone
Proceedings are now available online at <a href="http://www.slac.stanford.edu/econf/C110613/">eConf</a>

Spectra of Light and Heavy Mesons, Glueball and QCD Effective Coupling

Jun 16, 2011, 5:50 PM
20m
Festsaal (Künstlerhaus)

Festsaal

Künstlerhaus

talk Light Mesons Light Mesons

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)

Presentation materials