gosam is hosted by Hepforge, IPPP Durham

Welcome to the documentation page of GoSam. Here you can find informations about the usage of the code, about its interface with other codes and some ready to use packages to perform phenomenological analysis of specific processes at NLO. Just choose one of the following links:

Video tutorial:

A recorded tutorial seminar hold at the University of Padova is also available at the following link:


The package GoSam allows for the automated calculation of one-loop amplitudes for multi-particle processes in renormalizable quantum field theories. The amplitudes, which are generated in terms of Feynman diagrams, can be reduced using either D-dimensional integrand-level decomposition or by tensor reduction. GoSam can be used to calculate one-loop QCD and/or electroweak corrections to Standard Model processes and offers the flexibility to link model files for theories Beyond the Standard Model. A standard interface to programs calculating real radiation is also implemented.