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Unitary Methods for one-loop calculations

Unitary Methods for one-loop calculations
type:
time:

13./14./20./21.12.2014

lecturer:

Prof. Kirill Melnikov

Johns Hopkins University, KIT Distinguished Research Fellow

Abstract

Although the field of one-loop computations is mature, parton multiplicities in hard LHCevents are so high that traditional computational techniques become inefficient. Recently new approaches based on unitarity have been developed for calculating one-loop scattering amplitudes in quantum field theory. These methods are especially suitable for the description of multi-particle processes in QCD and are amenable to numerical implementations. They are also quite peculiar in that on-shell tree scattering amplitudes, rather than Feynman diagrams, can be used as an input. I will discuss the new methods in a pedagogical fashion and will explain conceptual and technical aspects of the new methods.