Automating dipole subtraction for QCD NLO calculations

TL;DR

This paper presents an automated algorithm integrated into a matrix element generator to efficiently generate dipole subtraction terms for NLO QCD calculations, streamlining the process of infrared divergence subtraction.

Contribution

The authors developed an automatic algorithm for dipole subtraction in QCD NLO calculations, implemented in AMEGIC++, enabling automatic generation of subtraction terms for any process.

Findings

Automated dipole subtraction code integrated into AMEGIC++

Facilitates NLO QCD calculations with minimal manual intervention

Enables direct generation of NLO parton level event samples

Abstract

In this publication the construction of an automatic algorithm to subtract infrared divergences in real QCD corrections through the Catani-Seymour dipole subtraction method [arXiv:hep-ph/9605323] is reported. The resulting computer code has been implemented in the matrix element generator AMEGIC++ [arXiv:hep-ph/0109036]. This will allow for the automatic generation of dipole subtraction terms and their integrals over the one-parton emission phase space for any given process. If the virtual matrix element is provided as well, this then directly leads to an NLO QCD parton level event generator.