2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43005The large-beta_0 limit of QCD is discussed, with the emphasize on simple technical methods of calculating various quantities at the order 1/β_0. Many examples, mainly from heavy quark physics, are considered. Some QCD results based on renormalization group (and not restricted to the large-β_0 limit) are also discussed.40 pages, 18 eps figures includedHigh Energy Physics - Phenomenologytext