2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43861A 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 figuresHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext