TH Meeting on Particle Physics Phenomenology

Unitarity methods at work on LHC processes

by Giulia Zanderighi (Oxford University)

TH Theory Conference Room (CERN)

TH Theory Conference Room


We discuss how to compute one-loop amplitudes in QCD by combining unitarity in higher dimensions with tree level recursion relations. We present results for all N-gluon one-loop amplitudes for arbitrary helicities. We show that the algorithm has a mild, polynomial growth in N and demonstrate the numerical stability of the results. Finally, we discuss the extension to more general LHC processes involving quarks and vector bosons, in particular we present new results for W+3jets, which is an omnipresent background in new physics searches at the LHC known up to now only at leading order.
Organized by

Stefano Frixione