2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47484The running of the strong coupling constant, $R_{e^+e^-},R_Z$ and $R_τ$ is studied on the three-loop level. Based on experimental data of $R_{e^+e^-},R_Z$ and $R_τ$ and the LEP multijet analysis, the light gluino scenario is excluded to 99.97% CL (window I) and 99.89% CL (window III).7 pages, 6 figures, talk at HEP97, JerusalemHigh Energy Physics - Phenomenologytext