2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173550We evaluate the compositeness effects of tau lepton on the vertex W-tau-nu(tau) in the context of an effective Lagrangian approach. We consider that only the third family is composed and we get the corrections to the non universal lepton coupling g_(tau)/g_(e). As the experimental bounds on non universal lepton couplings in W decays are weak, we find that the excited particles contributions do not give realistic limits on the excited mass, since they lead to Lambda<m*.7 pages, 3 figures, version to appear in Modern Physics Letters AHigh Energy Physics - Phenomenologytext