Nlo Qcd Corrections to the Production of a Weak Boson Pair Associated by a Hard Jet

In this talk we discuss recent progress concerning precise predictions for the LHC. We give a status report of an application of the GOLEM method to deal with multi-leg one-loop amplitudes, namely the next-to-leading order QCD corrections to the process pp → V V + jet, where V is a weak boson W ± , Z. The Large Hadron Collider (LHC) at CERN will probe our understanding of electroweak symmetry breaking and explore physics in the TeV region. A detailed theoretical knowledge of various kinds of Standard Model backgrounds is indispensable for these studies. Precise predictions for multi-partonic cross sections are only possible by including higher order corrections such that renormalisation and factorisation scale dependencies are tamed. During the Les Houches 2005 workshop, the process pp → V V jet was identified as one of the most important missing next-to-leading order (NLO) calculations 1. Indeed, by considering at least one additional jet in the final state, one can improve the Higgs signal significance 2. Then, this process represents an important background for the production of H + jet and new physics. Moreover, it is an important test before approaching more complicated many particle processes at NLO. The process with a charged vector boson pair has been evaluated recently by two independent groups 3,4. However, the evaluation for ZZ + jet is still missing.