On the Numerical Evaluation of One-Loop Amplitudes: the Gluonic Case

Details On the Numerical Evaluation of One-Loop Amplitudes: the Gluonic Case On the Numerical Evaluation of One-Loop Amplitudes: the Gluonic Case

2008-05-14

arxiv.org/abs/0805.2152v2

JHEP 0806:038,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 9 figures; v2: references added, version accepted for publication

Scientific paper

10.1088/1126-6708/2008/06/038

We develop an algorithm of polynomial complexity for evaluating one-loop amplitudes with an arbitrary number of external particles. The algorithm is implemented in the Rocket program. Starting from particle vertices given by Feynman rules, tree amplitudes are constructed using recursive relations. The tree amplitudes are then used to build one-loop amplitudes using an integer dimension on-shell cut method. As a first application we considered only three and four gluon vertices calculating the pure gluonic one-loop amplitudes for arbitrary external helicity or polarization states. We compare our numerical results to analytical results in the literature, analyze the time behavior of the algorithm and the accuracy of the results, and give explicit results for fixed phase space points for up to twenty external gluons.

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