Speaker
Description
We discuss critical analytical ingredients that are necessary to reproduce NSL terms of collinear origin in the context of a parton shower algorithm.
These ingredients are related to the resummation coefficient "B2" in an analytical resummation approach, which governs the intensity of collinear radiation from an energetic initial parton. They can also be viewed as defining the scheme of the strong coupling, beyond the known soft limit result given by the known coefficient A2.
We show how such ingredients may be calculated using specific integrals of the triple-collinear splitting functions and associated one-loop corrections. We also discuss new results ranging from analytic resummation for groomed jet shapes to NNLL event shape resummation in parton showers and achieving NSL non-singlet fragmentation in parton showers.