Calculating two- and three-body decays with FeynArts and FormCalc

摘要

The Feynman diagram generator FeynArts and the computer algebra program FormCalc allow for an automatic computation of 2 --> 2 and 2 --> 3 scattering processes in High Energy Physics. We have extended this package by four new kinematical routines and adapted one existing routine in order to accomodate also two- and three-body decays of massive particles. This makes it possible to compute automatically two- and three-body particle decay widths and decay energy distributions as well as resonant particle production within the Standard Model and the Minimal Supersymmetric Standard Model at the tree- and loop-level. The use of the program is illustrated with three standard examples: h --> b(b) over bar, mu --> e(nu) over bar(e)nu(mu) and Z --> nu(e) (nu) overbar(e). [References: 7]