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8 papers · 1 filter
Primary Feynman rules to calculate the epsilon-dimensional integrand of any 1-loop amplitude
R. Pittau
When using dimensional regularization/reduction the epsilon-dimensional numerator of the 1-loop Feynman diagrams gives rise to rational contributions. I list the set of fundamental…
aMC@NLO predictions for Wjj production at the Tevatron
Rikkert Frederix, Stefano Frixione, Valentin Hirschi +3
We use aMC@NLO to predict the lv+ 2-jet cross section at the NLO accuracy in QCD matched to parton shower simulations. We find that the perturbative expansion is well behaved for a…
Four-lepton production at hadron colliders: aMC@NLO predictions with theoretical uncertainties
Rikkert Frederix, Stefano Frixione, Valentin Hirschi +3
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 feature…
Helac-nlo
G. Bevilacqua, M. Czakon, M. V. Garzelli +5
Based on the OPP technique and the HELAC framework, HELAC-1LOOP is a program that is capable of numerically evaluating QCD virtual corrections to scattering amplitudes. A detailed…
W and Z/gamma* boson production in association with a bottom-antibottom pair
Rikkert Frederix, Stefano Frixione, Valentin Hirschi +3
We present a study of lνb\bar{b} and l+ l- b\bar{b} production at hadron colliders. Our results, accurate to the next-to-leading order in QCD, are based on automatic matrix-element…
Recent news and results in the computation of NLO processes with new techniques
Roberto Pittau
I illustrate new techniques and recently obtained results in the computation of perturbative QCD processes at the NLO accuracy
Scalar and pseudoscalar Higgs production in association with a top-antitop pair
Rikkert Frederix, Stefano Frixione, Valentin Hirschi +3
We present the calculation of scalar and pseudoscalar Higgs production in association with a top-antitop pair to the next-to-leading order (NLO) accuracy in QCD, interfaced with pa…
Automation of one-loop QCD corrections
Valentin Hirschi, Rikkert Frederix, Stefano Frixione +3
We present the complete automation of the computation of one-loop QCD corrections, including UV renormalization, to an arbitrary scattering process in the Standard Model. This is a…