2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189061We compute the differential distributions of two three-jet event-shape observables at the next-to-leading order accuracy at fixed values of the DIS kinematic variables. The observable $\Kout$ measures the out-of-event-plane momentum. The other observable $y_3$ is the maximum value of the $\ycut$ resolution variable for which an event is classified as three-jet event. We also show the dependence of the fixed-order predictions on the renormalisation and factorisation scales. The radiative corrections are in general large and depend on the value of the DIS kinematic range.11 pages, 6 figures, minor modifications and corrections, version accepted for publicationHigh Energy Physics - Phenomenologytext