Automation of one-loop QCD corrections

TL;DR

This paper introduces MadLoop, an automated framework integrating OPP integrand reduction into MadGraph, enabling fully automatic NLO QCD calculations for arbitrary processes at the LHC.

Contribution

It presents the first complete automation of one-loop QCD corrections within a flexible framework combining MadGraph and MadFKS.

Findings

Successfully computed various LHC processes at NLO in QCD.

Demonstrated the flexibility of the automated method.

Validated results against known calculations.

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.