Automated one-loop calculations with GoSam

TL;DR

GOSAM is an automated software package that efficiently computes one-loop amplitudes for complex multi-particle processes in QCD, electroweak, and BSM theories using various reduction techniques.

Contribution

This work introduces GOSAM, a versatile tool for automated one-loop calculations applicable to a wide range of particle physics theories.

Findings

Successfully computes one-loop amplitudes for QCD and electroweak processes

Supports models beyond the Standard Model

Demonstrates efficiency and flexibility in complex calculations

Abstract

In this talk, the program package GOSAM is presented, which can be used for the automated calculation of one-loop amplitudes for multi-particle processes. The integrands are generated in terms of Feynman diagrams and can be reduced by d-dimensional integrand-level decomposition, or tensor reduction, or a combination of both. Through various examples we show that GOSAM can produce one-loop amplitudes for both QCD and electroweak theory; model files for theories Beyond the Standard Model can be linked as well.