2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47682The importance of measuring the b-quark mass at different scales is emphasized. The recent next-to-leading order calculation of three jet heavy quark production at LEP and its use to measure $m_b(m_Z)$ is discussed.Talk given in the workshop Valencia97 "Physics Beyond the Standard Model", Oct 13-17, 1997, 7 pages, LaTeX with sprocl.styHigh Energy Physics - Phenomenologytext