Abstract:

The search for physics beyond the Standard Model at high-energy particle colliders requires a thorough understanding of new physics signals and Standard Model background processes. Large numbers of complicated Feynman diagrams with many quarks and gluons have to be summed up, in order to predict event rates accurately. In the past two years, spinoffs from "twistor string theory" have led to very efficient alternatives to Feynman diagrams for computing many of these scattering amplitudes, first at the tree level, and now at the loop level. In this talk, I will give an overview of the recent progress.