Journal
COMPUTER PHYSICS COMMUNICATIONS
Volume 132, Issue 3, Pages 306-315Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0010-4655(00)00151-X
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HELAC is a FORTRAN based package that is able to compute efficiently helicity amplitudes for arbitrary scattering processes within the standard electroweak theory. The algorithm exploits the virtues of the Dyson-Schwinger equations as compared to the traditional Feynman graph approach. All electroweak vertices are included in both the unitary and Feynman gauges, and computations including all mass effects are available. A version performing multi-precision computations with arbitrary - user defined - accuracy is also included, allowing access to any phase space point for arbitrary high energies. (C) 2000 Elsevier Science B.V. All rights reserved.
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