August 27, 2017 to September 1, 2017
Other Institutes
Europe/Zurich timezone

Full-colour decompositions for loop amplitudes in Yang-Mills theory

Aug 29, 2017, 6:00 PM


Hard QCD and EW Hard QCD and EW


Alexander Ochirov (University of Edinburgh)


I will present a general method to account for full colour dependence Yang-Mills amplitudes at loop level. The method fits most naturally into the framework of multi-loop integrand reduction and in a nutshell amounts to consistently retaining the colour structures of the unitarity cuts from which the integrand is gradually constructed. I will discuss connections to loop-level Kleiss-Kuijf relations and implications for cancellation of nontrivial symmetry factors at two loops. I will illustrate this technique on the recent calculation of the two-loop five-gluon amplitude with all positive-helicity gluons, as well as a three-loop example in supersymmetric Yang-Mills.

Primary authors

Alexander Ochirov (University of Edinburgh) Dr Ben Page (University of Freiburg)

Presentation materials