Precision predictions for SUSY and GUT processes at hadron colliders

Michael Klasen (Univ. Grenoble)

Particle physics beyond the Standard Model (SM), as proposed by Supersymmetry (SUSY) or Grand Unified Theories (GUTs), is often associated with new heavy particles, that decay into SM particles and missing transverse energy. Their discovery at hadroncolliderstherefore requires a precise knowledge of their absolute cross sections close to the production threshold as well of their transverse-momentum distributions. The Monte Carlo generators currently in use must thus be improved by fixed-order QCD corrections, which may either be resummedanalytically or matched to partonshowers. We discuss in particular the cases of sleptonand Z' production in typical SUSY and GUT models.