2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46269We argue that accounting for higher order corrections in QCD by integrating a running coupling constant through an infrared region can be most easily done with making use of a scheme without the Landau pole. Within this approach the entire ambiguity of the answer is identical to that of the choice of renormalization scheme. The uncertainties for the $τ$ lepton width resulting from such a technique are discussed.8 pages, LaTeX, one tableHigh Energy Physics - Phenomenologytext