Four-lepton production at hadron colliders: aMC@NLO predictions with theoretical uncertainties
Rikkert Frederix, Stefano Frixione, Valentin Hirschi, Fabio Maltoni,, Roberto Pittau, Paolo Torrielli
TL;DR
This paper presents a comprehensive NLO QCD prediction for four-lepton production at the LHC, including uncertainties, using aMC@NLO with parton showers, and accounts for off-shell and interference effects.
Contribution
It introduces an automated method to compute theoretical uncertainties in four-lepton production predictions at NLO, incorporating full off-shell and interference effects.
Findings
Accurate NLO predictions with full off-shell effects.
Quantified theoretical uncertainties for key distributions.
Validated predictions with different parton shower algorithms.
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 result and the contribution of the 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
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