Four-lepton production at hadron colliders: aMC@NLO predictions with theoretical uncertainties

Abstract

We use aMC@NLO to study the production of four charged leptons at the LHC, performing parton showers with both HERWIG and Pythia6. Our underlying matrix element calculation features the full next-to-leading order $O({\alpha }_S)$ result and the $O({\alpha }_S^2)$ contribution of the $gg$ channel, and it includes all off-shell, spin-correlation, virtual-photon-exchange, and interference effects. We present several key distributions together with the corresponding theoretical uncertainties. These are obtained through a process-independent technique that allows aMC@NLO to compute scale and PDF uncertainties in a fully automated way and at no extra CPU-time cost

24 pages, 6 figures

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• Matched predictions for Higgs production via heavy-quark loops in the SM and beyond
• Higher-order QCD effects in the Higgs to ZZ search channel at the LHC
• Gluon-induced QCD corrections to pp --> ZZ --> l anti-l l' anti-l'

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