CutTools: a program implementing the OPP reduction method to compute one-loop amplitudes
High Energy Physics - Phenomenology
2011-05-05 v2
Abstract
We present a program that implements the OPP reduction method to extract the coefficients of the one-loop scalar integrals from a user defined (sub)-amplitude or Feynman Diagram, as well as the rational terms coming from the 4-dimensional part of the numerator. The rational pieces coming from the epsilon-dimensional part of the numerator are treated as an external input, and can be computed with the help of dedicated tree-level like Feynman rules. Possible numerical instabilities are dealt with the help of arbitrary precision routines, that activate only when needed.
Cite
@article{arxiv.0711.3596,
title = {CutTools: a program implementing the OPP reduction method to compute one-loop amplitudes},
author = {Giovanni Ossola and Costas G. Papadopoulos and Roberto Pittau},
journal= {arXiv preprint arXiv:0711.3596},
year = {2011}
}
Comments
Version published in JHEP