Scattering Amplitudes with Open Loops
Stefano Pozzorini (Universität Zürich)

I will present a numerical one-loop algorithm, introduced in arXiv:1111.5206 [hep-ph], which is based on the recursive construction of loop-momentum polynomials called open loops. This novel approach permits to generate one-loop scattering amplitudes for multi-particle processes in a fully automatic and highly efficient way.