Exploring the infrared structure of massless gauge theories

by Lorenzo Magnea (University of Turin)

Monday 15 Jan 2024, 14:00 → 16:00 Europe/Berlin

The problem of infrared divergences in gauge-theory scattering amplitudes 

is as old as quantum field theory, and has been `solved’ many times, with increasing 

degrees of sophistication. Perhaps surprisingly, it is still at the forefront of current 

research, both in view of theoretical developments, and for phenomenological 

applications. I will provide an overview of the state of the art for infrared factorisation

of scattering amplitudes, and then I will briefly present two current research directions:

the problem of infrared subtraction for the precision calculation of collider observables,

and the surprising connection between infrared behaviour in d=4 and two-dimensional

conformal field theories on the `celestial sphere’.

Bonn_24.pdf