2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/207449Using data collected with the OPAL detector at LEP, we have searched for the processes e+e- -> Z0 -> p e-, p mu- and the charge conjugate final-states. These would violate the conservation of the baryon-number B, lepton-number L and the fermion-number n = (B+L). No evidence for such decays has been found, and the 95% confidence level upper limits on the partial widths Z0 -> p e and Z0 -> p mu are found to be 4.6 and 4.4 keV respectively.16 pages, LaTeX, 2 ps figs included, submitted to Physics Letters BHigh Energy Physics - Experimenttext