Theory Seminar: Sebastian Jaskiewicz

Conference Date
Conference Location

CEBAF Center L102

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Speaker: Sebastian Jaskiewicz (Durham University)

Title: Developments in subleading power factorization and resummation

Abstract: Precise theoretical predictions are a key ingredient in ongoing tests of the Standard Model and in searches for physics beyond it. Since its inception twenty years ago, Soft Collinear Effective Theory (SCET) has been successfully applied to improve the precision of many important observables in collider physics. It is now standard practice to use SCET to derive factorization theorems and apply renormalization group (RG) methods to achieve leading power resummation of large logarithms that appear in regions of phase space with disparate energy scales. In this talk, I will discuss the recent developments in taking the step beyond the leading term in the power expansion. Focusing on the threshold Drell-Yan process, I will explain how the general factorization formula can be derived and I will discuss new objects that emerge beyond leading power: collinear jet functions and generalized soft functions. I will also explain challenges and advancements in achieving resummation at LL and beyond at next-to-leading power.