High multiplicity processes at NLO with BlackHat and Sherpa

Abstract

In this contribution we review recent progress with fixed-order QCD predictions for the production of a vector boson in association with jets at hadron colliders, using the programs BlackHat and SHERPA. We review general features of next-to-leading-order (NLO) predictions for the production of a massive vector boson in association with four jets. We also discuss how precise descriptions of vector-boson production can be applied to the determination of backgrounds to new physics signals. Here we focus on data-driven backgrounds to a missing-energy-plus-jets search performed by CMS. Finally, we review recent progress in developing theoretical tools for high-multiplicity loop-computation within the BlackHat-library. In particular, we discuss methods for handling the color degrees of freedom in multi-jet predictions at NLO.

12 pages, contribution to the proceedings of Loops and Legs 2012

References in corpus (8)

• Event generation with SHERPA 1.1
• An Automated Implementation of On-Shell Methods for One-Loop Amplitudes
• Precise Predictions for W + 4 Jet Production at the Large Hadron Collider
• Next-to-Leading Order QCD Predictions for W+3-Jet Distributions at Hadron Colliders
• A new critical study of photon production in hadronic collisions
• All tree-level amplitudes in massless QCD
• Next-to-leading order QCD predictions for $Z^0{H}^0+\mathrm{jet}$ production at LHC
• Missing Energy and Jets for Supersymmetry Searches