Speaker
Georgios Papathanasiou
Description
In the Wilson loop OPE approach, scattering amplitudes in N=4 super Yang-Mills theory are given by an infinite sum
over all excitations of an integrable flux tube. As a first step towards the resummation of the entire series, we
compute the contribution of all single gluon bound states in the weak coupling expansion of the MHV 6-point (or
hexagon) amplitude, with the help of nested sum technology. The result is expressed in terms of 2-dimensional
harmonic polylogarithms, and very interestingly it also yields the full amplitude in multi-Regge kinematics, under
the assumption that the natural function space for the latter are single-valued harmonic polylogarithms.