TH Meeting on Particle Physics Phenomenology
# Unitarity methods at work on LHC processes

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by

→
Europe/Zurich

TH Theory Conference Room (CERN)
### TH Theory Conference Room

#### CERN

Description

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