2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40837We show that, according to the scheme of spontaneous breakings starting from a GUT with symmetry E6, it is possible that either a superheavy particle without ordinary interactions is source of ultra-high energy cosmic rays or a not so heavy lepton mixes with muon explaining the recently observed discrepancy of the anomalous magnetic moment of the latter.8 pages, Latex, 4 figures epsHigh Energy Physics - Phenomenologytext