Factorization and resummation at subleading powers
Soft Collinear Effective Theory (SCET) formalism has been successfully
applied to many important observables in collider physics, improving
the accuracy of fixed-order predictions via the leading power
resummation of large logarithmic contributions which appear in certain regions of phase space. Recently, investigations of the subleading power corrections have received significant attention. In this talk, I will discuss the framework for the threshold resummation of the Drell-Yan process at next-to-leading power using SCET. I will explain how to derive the general factorisation formula and discuss the new objects that emerge beyond leading power: collinear jet functions and generalized soft functions. The leading logarithmic solution of the RG equations will be presented. I will perform a comparison with known fixed order results and discuss the appearance of endpoint divergences in convolution integrals which hamper the extension of the framework beyond leading logarithmic accuracy. Then, with the goal of overcoming this complication, I will focus on the off-diagonal DIS near the threshold x → 1 limit, and show how d-dimensional consistency relations allow for the summation of the large double logarithms to all orders in the strong coupling constant.
Zoom link: IPPP Seminars (Thursday at 2 pm UK time)
Meeting ID: 994 2012 4988