Vector Boson + Jets with BlackHat and Sherpa

Understand

We review recent NLO QCD results for W,Z + 3-jet production at hadron colliders, computed using BlackHat and SHERPA.

• We also include some new results for Z + 3-jet production at the LHC at 7 TeV.
• We report new progress towards the NLO cross section for W + 4-jet production.
• In particular, we show that the virtual matrix elements produced by BlackHat are numerically stable.