The Regge Limit and infrared singularities of QCD scattering amplitudes to all orders

Abstract

In this talk we discuss recent progress in understanding the iterative structure of scattering amplitudes in the high-energy limit. As an application, we show that by using BFKL theory it is possible to determine the infrared divergent part of two-parton amplitudes to all orders in perturbation theory and to next-to-leading-logarithmic accuracy in the high-energy limit, resumming the two-Reggeon contribution. Remarkably, the infrared-singular part can be expressed in a closed form. This allows us to predict the Regge limit of the soft anomalous dimension to any loop order.