Speaker
Description
By breaking dual conformal invariance, we transform cluster-algebraic predic-
tions for the alphabet of 9-point amplitudes in N = 4 super Yang-Mills theory to analogous
predictions for 5- and 6-point processes in QCD. We start by obtaining, for the first time,
candidate letters for 6-point processes with one massive external leg, and confirm that
they essentially contain those of all 1-loop integrals with these kinematics. Taking the
limit where the massive leg becomes massless, we then reproduce the 167 letters recently
argued to suffice for the finite part of planar 2-loop amplitudes for 6-point massless QCD
processes, and further predict another 14 letters that might appear at higher loops. Similarly,
we analyse the 5-point 2-mass case, where we manage to match with almost all known letters known by direct Feynman Integral computations. Finally, we comment on positivity properties of these letters.
