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Manuscript Title: Golem95: a numerical program to calculate one-loop tensor integrals with up to six external legs | ||

Authors: T. Binoth, J.-Ph. Guillet, G. Heinrich, E. Pilon, T. Reiter | ||

Program title: golem95_v1.0 | ||

Catalogue identifier: AEEO_v1_0Distribution format: tar.gz | ||

Journal reference: Comput. Phys. Commun. 180(2009)2317 | ||

Programming language: Fortran95. | ||

Computer: Any computer with a Fortran95 compiler. | ||

Operating system: Linux, Unix. | ||

RAM: RAM used per form factor is insignificant, even for a rank six six-point form factor. | ||

Keywords: NLO Computations, One-Loop Diagrams, Tensor Reduction. | ||

PACS: 12.38.Bx. | ||

Classification: 4.4, 11.1. | ||

External routines: Perl programming language (http://www.perl.com/) | ||

Nature of problem:Evaluation of one-loop multi-leg tensor integrals occurring in the calculation of next-to-leading order corrections to scattering amplitudes in elementary particle physics. | ||

Solution method:Tensor integrals are represented in terms of form factors and a set of basic building blocks ("basis integrals"). The reduction to the basis integrals is performed numerically, thus avoiding the generation of large algebraic expressions. | ||

Restrictions:The current version contains basis integrals for massless internal particles only. Basis integrals for massive internal particles will be included in a future version. | ||

Running time:Depends on the nature of the problem. A rank 6 six-point form factor at a randomly chosen kinematic point takes 0.13 seconds on an Intel Core 2 Q9450 2.66GHz processor, without any optimisation. With compiler optimisation flag -O3 the same point takes 0.09 seconds. Timings for lower point form factors are: All form factors for five-point functions from rank 0 to rank 4: 0.04 s All form factors for rank 5 five-point functions: 0.05 s All form factors for four-point functions from rank 0 to rank 4: 0.01 s. |

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