NNLO vs parton-showers - THEP Mainz

H WW at NNLO(CA, Dissertori, Stoeckli)• used the fully differential NNLO program FEHiP for pp+X• CA, Melnikov, Petriello• added decay matrix-element for the process HWlνlν• large phase-space rejection required reworking the numericalintegration strategy• independent, parallelized VEGAS integration for individual sectors• large improvement of integration adaptation (from no-adaptation toadaptation within a few VEGAS iterations)• easy exploitation of cluster computing• all numbers/plots in our paper required about one week ofrunning time on average 450 CPU’s13