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.
@article{arxiv.1201.2782,
title = {Automated one-loop calculations with GoSam},
author = {G. Cullen and N. Greiner and G. Heinrich and G. Luisoni and P. Mastrolia and G. Ossola and T. Reiter and F. Tramontano},
journal= {arXiv preprint arXiv:1201.2782},
year = {2012}
}
Comments
Reference added in version 2. Talk given at the 10th International Symposium on Radiative Corrections - RADCOR 2011; Mamallapuram, India, September 2011