Vector Boson + Jets with BlackHat and Sherpa
C. F. Berger, Z. Bern, L. J. Dixon, F. Febres Cordero, D. Forde, T., Gleisberg, H. Ita, D. A. Kosower, D. Maitre
TL;DR
This paper reviews recent NLO QCD calculations for vector boson plus jets production at hadron colliders using BlackHat and SHERPA, highlighting progress in computational stability and new results at the LHC.
Contribution
It presents new NLO results for Z + 3-jet production at 7 TeV LHC and demonstrates improved computational stability and methods for W + 4-jet production using BlackHat and SHERPA.
Findings
Virtual matrix elements are numerically stable.
SHERPA produces well-behaved real-emission contributions.
Progress towards NLO cross section for W + 4-jet production.
Abstract
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. We also show that with an improved integrator and tree-level matrix elements from BlackHat, SHERPA produces well-behaved real-emission contributions. As an illustration, we present the real-emission contributions -- including dipole-subtraction terms -- to the p_T distribution of the fourth jet, for a single subprocess with the maximum number of gluons.
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Taxonomy
TopicsGamma-ray bursts and supernovae · Pulsars and Gravitational Waves Research · Particle physics theoretical and experimental studies