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

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Ossola, Giovanni
Papadopoulos, Costas G.
Pittau, Roberto
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Abstract
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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.
Comment: Version published in JHEP
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High Energy Physics - Phenomenology
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