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arxiv: 0711.3596 · v2 · pith:2UYSTMUOnew · submitted 2007-11-22 · ✦ hep-ph

CutTools: a program implementing the OPP reduction method to compute one-loop amplitudes

Giovanni Ossola , Costas G. Papadopoulos , Roberto Pittau This is my paper
classification ✦ hep-ph
keywords comingfeynmanhelpmethodnumeratorone-looppartprogram
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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.

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