Two-loop five-point massless QCD amplitudes within the IBP approach

Understand

We solve the integration-by-parts (IBP) identities needed for the computation of any planar two-loop five-point massless amplitude in QCD.

• We also derive some new results for the most complicated non-planar topology with irreducible numerators of power as high as six.
• We do this by applying a new strategy for solving the IBP identities which scales better for problems with a large number of scales and/or master integrals.
• Our results are a proof of principle that the remaining non-planar contributions for all two-loop five-point massless QCD amplitudes can be computed in analytic form.