# Factorisation and resummation at subleading power

#### Factorisation and resummation at subleading power

- Event time: 1:00pm until 2:00pm
- Event date: 3rd November 2021
- Speaker: Dr Sebastian Jaskiewicz (Durham University)
- Location: Higgs Centre Seminar Room, Room 4305, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

Advancing the precision of theoretical predictions is a key ingredient in the ongoing Standard Model tests and searches for physics beyond our current paradigm. 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 factorisation theorems and apply renormalisation group (RG) methods to perform the leading power resummation of large logarithmic contributions 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 to derive the general factorisation formula and discuss the new objects that emerge beyond leading power: collinear jet functions and generalised soft functions. I will present the leading logarithmic solution of the RG equations and describe challenges in increasing the logarithmic accuracy of resummation at next-to-leading power.

#### Event resources

### About Particle Physics Theory seminars

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..