Using unitarity cuts to calculate (the imaginary part of) Feynman integrals

Speaker

Andries Waelkens, From the Higgs Centre for Theoretical Physics, University of Edinburgh

Abstract

Calculating the imaginary parts of Feynman diagrams is useful for a variety reasons, including calculating the diagrams themselves. There is a direct diagrammatic way to calculate these imaginary parts, by taking so-called unitarity cuts. I present an introduction starting from the basics of QFT, based on the approach in the classic paper "Diagrammar" by ’t Hooft and Veltman (PDF).