Vector Boson + Jets with BLACKHAT and SHERPA
Abstract
We review recent NLO QCD results for W, Z+3jet production at hadron colliders, computed using BLACKHAT and SHERPA. We also include some new results for Z+3jet production at the LHC at 7 TeV. We report new progress towards the NLO cross section for W+4jet production. In particular, we show that the virtual matrix elements produced by BLACKHAT are numerically stable. We also show that with an improved integrator and treelevel matrix elements from BLACKHAT, SHERPA produces wellbehaved realemission contributions. As an illustration, we present the realemission contributions  including dipolesubtraction terms  to the p distribution of the fourth jet, for a single subprocess with the maximum number of gluons.
 Publication:

Nuclear Physics B Proceedings Supplements
 Pub Date:
 August 2010
 DOI:
 10.1016/j.nuclphysbps.2010.08.025
 arXiv:
 arXiv:1005.3728
 Bibcode:
 2010NuPhS.205...92B
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment
 EPrint:
 6 pages, 4 figures, presented at Loops and Legs 2010