HEP Theory Journal Club

From the BFKL equation to the all-order infrared behaviour of high-energy scattering amplitudes_

Joscha Reichel

University of Edinburgh

In our most recent paper [1711.04850], we describe how we determined the soft anomalous dimension in the high-energy limit from a special kinematic region of the BFKL evolution. The soft anomalous dimension is a universal quantity that governs the infrared/soft singularities of scattering amplitudes. The BFKL equation, originally developed in the context of Pomeron resummation, can be used as a tool to generate two-to-two scattering amplitudes in the high-energy limit at next-to-leading logarithmic accuracy. My goal is to walk you through the most important steps of the calculation and, without getting too technical, explain how this rare example of an all-order prediction in QCD required only “beginner-level” QFT methods.