Parton Shower Effects on W and Z Production via Vector Boson Fusion at NLO QCD

Abstract

We present the implementation of electroweak Zjj and Wjj production via vector boson fusion with fully leptonic decays at NLO QCD in the POWHEG framework. These processes represent an important background to Higgs searches in vector boson fusion, but they also can be seen as signal processes to study anomalous triple vector boson couplings as well as the impact of a central jet veto. Observables related to the third jet are sensitive to the parton shower which is used, a fact which is demonstrated by a comparison between PYTHIA, the standard angular-ordered HERWIG++ shower and the new p_T-ordered Dipole Shower in HERWIG++.

arXiv comment16 pages, 7 figures, 1 table. Reference added, typos fixed

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• W and Z bosons in association with two jets using the POWHEG method
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• Parton Shower Matching Systematics in Vector-Boson-Fusion WW Production
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• Vector Bosons and Jets in Proton Collisions
• Precise predictions for V+2 jet backgrounds in searches for invisible Higgs decays
• Anomalous neutral gauge boson interactions and simplified models
• Logarithmic corrections to the QCD component of same-sign W-pair production for VBS studies