Automation of one-loop QCD corrections

Abstract

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 achieved by embedding the OPP integrand reduction technique, as implemented in CutTools, into the MadGraph framework. By interfacing the tool so constructed, which we dub MadLoop, with MadFKS, the fully automatic computation of any infrared-safe observable at the next-to-leading order in QCD is attained. We demonstrate the flexibility and the reach of our method by calculating the production rates for a variety of processes at the 7 TeV LHC.

64 pages, 12 figures. Corrected the value of m_Z in table 1. In table 2, corrected the values of cross sections in a.4 and a.5 (previously computed with mu=mtop/2 rather than mu=mtop/4). In table 2, corrected the values of NLO cross sections in b.3, b.6, c.3, and e.7 (the symmetry factor for a few virtual channels was incorrect). In sect. A.4.3, the labeling of the four-momenta was incorrect

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• Parton distributions for the LHC
• Reducing full one-loop amplitudes to scalar integrals at the integrand level
• OneLOop: for the evaluation of one-loop scalar functions
• Automation of next-to-leading order computations in QCD: the FKS subtraction
• Assault on the NLO Wishlist: pp -> tt bb
• A Numerical Unitarity Formalism for Evaluating One-Loop Amplitudes
• On the Rational Terms of the one-loop amplitudes
• Precise Predictions for W + 4 Jet Production at the Large Hadron Collider
• NLO QCD corrections to t tbar + jet production at hadron colliders
• Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order
• The complex-mass scheme for perturbative calculations with unstable particles
• NLO QCD corrections to WWbb production at hadron colliders
• Dominant QCD Backgrounds in Higgs Boson Analyses at the LHC: A Study of pp -> t anti-t + 2 jets at Next-To-Leading Order
• Next-to-leading-order predictions for t-channel single-top production at hadron colliders
• Hadronic top-quark pair production in association with a hard jet at next-to-leading order QCD: Phenomenological studies for the Tevatron and the LHC
• On the Numerical Evaluation of One-Loop Amplitudes: the Gluonic Case
• NLO QCD corrections to five-jet production at LEP and the extraction of alpha_s(M_Z)
• NLO QCD corrections to W boson production with a massive b-quark jet pair at the Fermilab Tevatron p-pbar collider
• QCD corrections to the hadronic production of a heavy quark pair and a W-boson including decay correlations
• Feynman rules for the rational part of the Electroweak 1-loop amplitudes in the R_xi gauge and in the Unitary gauge
• Testing and improving the numerical accuracy of the NLO predictions

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