2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36988I will review new studies of b-quark fragmentation performed at the Z peak by ALEPH and SLD. An improved sensitivity to distinguish between fragmentation model and more accurate measurements of the mean b-hadron scaled energy have been obtained.3 pages, 3 figures, presented at XXXth ICHEP, OsakaHigh Energy Physics - Experimenttext