Status of OpenLoops and Simulation of H->WW Backgrounds

We report on the OPENLOOPS generator for one loop matrix elements which combines a numer ical recursion to construct the numerator of one loop Feynman diagrams as functions of the loop momentum with tensor integral reduction. We interfaced OPENLOOPS to the SHERPA Monte Carlo event generator in order to fully automate the simulation of next to leading order scattering processes. Within the SHERPA+OPENLOOPS framework we study H >WW background sim ulations in exclusive jet bins achieving next to leading order plus parton shower accuracy in the 0 and 1 jet bins.