Sala Seminarios IFIC (Edf. Institutos de Investigación)
Sala Seminarios IFIC
Edf. Institutos de Investigación
Descripción
I will present a collection of new results obtained with different tools to describe different aspects of perturbative QCD. The consistent combination of tree-level matrix elements and parton showers is a key feature of the Sherpa Monte Carlo event generator. Using very recent Tevatron data Sherpa predictions for vector bosons plus jets are shown and emphasize the importance of the CKKW merging approach implemented in Sherpa. In the 2nd part I discuss a new shower model for hadronic collisions based on the evolution of perturbative colour dipoles. Encouraging data comparisons are presented. In the last part I present a computer program, which numerically evaluates colour-ordered gluon one-loop amplitudes based on the unitarity method proposed by Ellis, Giele, Kunszt and Melnikov. In all cases the basic principles underlying the different calculational methods are briefly discussed.