The infrared structure of perturbative QCD

Prof. Dr. Lorenzo Magnea (Torino U.)

Date(s) - 25/06/2021

video conference (zoom)

Abstract: Infrared problems in the evaluation of gauge-theory amplitudes and cross sections
have been a focus of theoretical research for close to a century. Yet, new discoveries and new
ideas continue to emerge, and high-precision phenomenology requires further sharpening
of our tools. I will review our present understanding of the infrared structure of non-abelian
scattering amplitudes, emphasising the ideas of universality, factorisation, evolution and
resummation. I will briefly introduce new ideas for the analysis of soft divergences using
conformal field theory tools, and finally I will discuss the problem of infrared subtraction
for high-order predictions of complex collider observables.