Calculating two- and three-body decays with FeynArts and FormCalc
arXiv:hep-ph/0210426 · doi:10.1142/S012918310300539X
Abstract
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\bar{b}, μ->e\barν_eν_μ, and Z->ν_e\barν_e.
8 pages, 1 figure