2000 character limit reached
The Soft Anomalous Dimension at four loops in the Regge Limit (2111.01517v2)
Published 2 Nov 2021 in hep-ph and hep-th
Abstract: The soft anomalous dimension governs the infrared divergences of scattering amplitudes in general kinematics to all orders in perturbation theory. By comparing the recent Regge-limit results for $2\to2$ scattering (through Next-to-Next-to-Leading Logarithms) in full colour to a general form for the soft anomalous dimension at four loops we derive powerful constraints on its kinematic dependence, opening the way for a bootstrap-based determination.