2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44474Lepton generation universality holds very well in Z decays, but appears to be violated in recent LEP data of W leptonic decay branching fractions. If this trend persists, a consistent and natural explanation is a model of generation nonuniversality, based on the gauge group SU(2)_L X U(1)_R X U(1)_{B-L}.16 pages, no figureHigh Energy Physics - Phenomenologytext