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

摘要

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( a_s ) mathcal{O}left( {{alpha_s}} right) result and the O( a_s2 ) mathcal{O}left( {alpha_s^2} right) 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.