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Durham University

Department of Physics

Staff profile

Publication details for Simon Badger

Hartanto, Heribertus Bayu, Badger, Simon, Brønnum-Hansen, Christian & Peraro, Tiziano (2019). A numerical evaluation of planar two-loop helicity amplitudes for a W-boson plus four partons. Journal of High Energy Physics 2019(9): 119.

Author(s) from Durham


We present the first numerical results for the two-loop helicity amplitudes for the scattering of four partons and a W-boson in QCD. We use a finite field sampling method to reduce directly from Feynman diagrams to the coefficients of a set of master integrals after applying integration-by-parts identities. Since the basis of master integrals is not yet fully known analytically, we identify a set of master integrals with a simple divergence structure using local numerator insertions. This allows for accurate numerical evaluation of the amplitude using sector decomposition methods.