5. Theoretical Physics (CSN4)

Analytic QCD ingredients for NNLL resummation and parton showers

by Mrinal Dasgupta (Manchester)

Aula Seminari (Laboratori Nazionali di Frascati)

Aula Seminari

Laboratori Nazionali di Frascati


We discuss QCD calculations for specific analytic ingredients necessary to construct high logarithmic accuracy (NNLL) parton showers.

In particular we show how to extend the notion of a physical coupling defined in the soft limit into the collinear region. This extension allows for the incorporation of the resummation coefficient known as B2 into a parton shower in an observable independent manner.

Combined with other key developments we mention, our results allow parton showers to achieve NNLL accuracy for a wide class of observables.