2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48155To describe pion as a bound state of two quark, when their current masses are non equal to zero, is considered. In the framefowrk of the potential approximate the Schwinger-Dyson and Bethe-Salpeter equations are solved. The quark-antiquark interaction as sum of the oscillator and Coulomb potential is chosen. The mass and constant of pion are calculated.7 pages, 2 postscript figures, use psfig.styHigh Energy Physics - Phenomenologytext