2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49640The present theoretical status of the parameter for direct CP violation epsilon'/epsilon in the Standard Model is reviewed and compared with most recent experimental measurements of the same quantity. After collecting the basic expressions for epsilon'/epsilon, the situation of hadronic matrix element calculations is summarised. The matrix elements constitute the dominant source of uncertainty for theoretical determinations of epsilon'/epsilon. For central values of the input parameters, the numerical analysis then yields results which are generally below the experimental data. Possible reasons for these findings are discussed.10 pages, 2 figures, talk given at Heavy Flavour 8, Southampton, UK, 1999High Energy Physics - PhenomenologyHigh Energy Physics - ExperimentHigh Energy Physics - Latticetext