2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38405In this article I will review the measurements of the b quark mass performed by ALEPH and DELPHI and presented at the HEP99 Conference in Tampere. Very clean effects of the mass running are observed, even if a wide spread in the results and large systematic errors due to hadronization corrections prevent to extract an average value of the running b quark mass.3 pages, 1 figuresHigh Energy Physics - Experimenttext