HELAC-NLO

Abstract
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 presentation of the algorithm is given, along with instructions to run the code and benchmark results. The program is part of the HELAC-NLO framework that allows for a complete evaluation of QCD NLO corrections.

Title of program: HELAC-1LOOP
Catalogue Id: AEOC_v1_0

Nature of problem
The evaluation of virtual one-loop amplitudes for multi-particle scattering is a longstanding problem [1]. In the last years the OPP reduction technique [2] opened the road for a fully numerical approach based on the evaluation of the one-loop amplitude for well-defined values of the loop momentum.

Versions of this program held in the CPC repository in Mendeley Data
AEOC_v1_0; HELAC-1LOOP; 10.1016/j.cpc.2012.10.033

This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)