NLO QCD corrections to pp/ppbar --> WW+jet+X including leptonic W-boson decays

Understand

We report on the calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at the Tevatron and the LHC, which is an important source of background for Higgs and new-physics searches.

• Leptonic decays of the W bosons are included by applying an improved version of the narrow-width approximation that treats the W bosons as on-shell particles, but keeps the information on the W spin.
• Contributions from external bottom quarks are neglected, because they are either numerically suppressed or should be attributed to different processes such as Wt or ttbar production.
• A survey of differential NLO QCD cross sections is provided both for the LHC and the Tevatron.