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The Soft Anomalous Dimension at four loops in the Regge Limit

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.

preprint2022arXivOpen access
Niamh MaherGiulio FalcioniEinan GardiCalum MilloyLeonardo Vernazza
hep-phhep-th
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Niamh MaherGiulio FalcioniEinan GardiCalum MilloyLeonardo Vernazza

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