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Numerical evaluation of multi-gluon amplitudes for High Energy Factorization

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arxiv 1503.08612 v3 pith:NUN5SJDJ submitted 2015-03-30 hep-ph

classification hep-ph
keywords amplitudesnumericalrecursionbcfwmulti-gluonprogramanalyticbeen
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We present a program to evaluate tree-level multi-gluon amplitudes with up to two of them off-shell. Furthermore, it evaluates squared amplitudes summed over colors and helicities for up to six external gluons. It employs both analytic expressions, obtained via BCFW recursion, and numerical BCFW recursion. It has been validated numerically with the help of an independent program employing numerical Dyson-Schwinger recursion.

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