2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36868I will review new measurements of the b quark mass, presented at this conference by ALEPH and DELPHI. A large set of observables has been used and detailed studies on jet algorithms have been performed. These measurements at the Z peak are consistent with the results obtained at the Upsilon scale when assuming the running of the b quark mass as predicted by perturbative QCD.2 pages, 1 figure, presented at XXXth ICHEP, OsakaHigh Energy Physics - Experimenttext