Three-jet event-shapes in lepton-proton scattering at next-to-leading order accuracy

摘要

We 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 K-out measures the out-of-event-plane momentum. The other observable gamma(3) is the maximum value of the gamma(cut) resolution variable for which an event is classified as three-jet event. We also show the dependence of the fixed-order predictions on the renormalization and factorization scales. The radiative corrections are in general large and depend on the value of the DIS kinematic range. (c) 2006 Elsevier B.V. All rights reserved.