  A method to efficiently compute, in a automatic way, helicity amplitudes for
arbitrary scattering processes at leading order in the Standard Model is
presented. The scattering amplitude is evaluated recursively through a set of
Dyson-Schwinger equations. The computational cost of this algorithm grows
asymptotically as 3^n, where n is the number of particles involved in the
process, compared to n! in the traditional Feynman graphs approach. Unitary
gauge is used and mass effects are available as well. Additionally, the color
and helicity structures are appropriately transformed so the usual summation is
replaced by Monte Carlo techniques. Some results related to the production of
vector bosons and the Higgs boson in association with jets are also presented.
