The QCD analytic effective charge and its dependence on the pion mass
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A new model for the QCD analytic running coupling, which incorporates the effects due to the $π$ meson mass, is proposed. The properties of this invariant charge in spacelike and timelike regions are examined. Its main distinctive features are a finite infrared limiting value, which depends on the pion mass, and the "plateau-like" behavior in the deep infrared domain of the timelike region.
Talk given at Eighth Workshop on Nonperturbative QCD, 7 - 11 June 2004, Paris, France; 6 pages, 2 EPS figures
Talk given at Eighth Workshop on Nonperturbative QCD, 7 - 11 June 2004, Paris, France; 6 pages, 2 EPS figures