Automating dipole subtraction

TL;DR

This paper presents an automated method for implementing the Catani-Seymour dipole subtraction technique, streamlining the handling of infrared divergences in NLO QCD calculations for complex processes.

Contribution

It introduces an automated framework for generating dipole terms, computing color-linked squared Born matrix elements, and evaluating helicity amplitudes in NLO QCD.

Findings

Successfully tested on complex processes like gg → t t̄ ggg

Demonstrates efficiency and accuracy of automation in infrared divergence treatment

Facilitates calculations in high-energy particle physics

Abstract

We report on automating the Catani-Seymour dipole subtraction which is a general procedure to treat infrared divergences in real emission processes at next-to-leading order in QCD. The automatization rests on three essential steps: the creation of the dipole terms, the calculation of the color linked squared Born matrix elements, and the evaluation of different helicity amplitudes. The routines have been tested for a number of complex processes, such as the real emission process gg --> t anti-t ggg.