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Manuscript Title: Numerical calculation of Feynman amplitudes for electroweak theories and an application to e+ e- -> W+W-gamma.
Authors: H. Tanaka, T. Kaneko, Y. Shimizu
Program title: CHANEL VERSION 2
Catalogue identifier: ABLT_v2_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 64(1991)149
Programming language: Fortran.
Computer: FACOM-M780.
Operating system: OSIV/F4 MSP(FACOM), VOS3(HITAC).
RAM: 180K words
Word size: 32
Peripherals: disc.
Keywords: Particle physics, Elementary, Qed, Helicity amplitude, Electroweak theory, Event generator, W pair production, General purpose, Diagramatic expansions.
Classification: 4.4, 11.4.

Nature of problem:
Measurements of higher order effects of electroweak interactions at high energies give crucial tests of Standard Model in elementary particle physics. In electroweak theories, various types of interactions contribute so that calculations of these effects become quite complicated in the framework of the traditional technique based on algebraic manipulation. It is therefore desirable to construct more efficient algorithms to calculate cross sections for complicated and numerous sets of Feynman diagrams in such models.

Solution method:
Program package CHANEL proposed previously is extended to be capable of calculating processes of electroweak interactions. All possible types of interactions which appear in the standard electroweak theory (Weinberg-Salam model) are added in the program package. It is easy to include this type of vertices in CHANEL without any change of the basic algorithm for the calculation. This improvement allows us to make fast numerical calculation of the higher order contributions in electroweak theories.