On non-abelian next-to-leading-power threshold logarithms
Lorenzo Magnea, Domenico Bonocore, Eric Laenen, Leonardo Vernazza, Chris D. White · Institutional Research Information System University of Turin (University of Turin) · 2016
We present recent results in an ongoing program to construct a resummation formalism for threshold logarithms at next-to-leading power (NLP) in the threshold expansion.We discuss a factorised expression for the Drell-Yan scattering amplitude, valid at NLP, which arises from the Low-Burnett-Kroll-Del Duca theorem, and correctly reproduces all relevant logarithms at two loops for the abelian-like color structure.We then discuss methods to generalise this formalism to the full non-abelian theory, and propose a simple ansatz which succeeds in generating all non-abelian NLP logarithms at two loops, in terms of a small set of universal soft and collinear functions.Loops and Legs in Quantum Field Theory 24-29