# Exploring the infrared structure of massless gauge theories

- Institution: CERN
- Department: Theory Colloquia
- Speaker: Lorenzo Magnea
- Year: 2024
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3006161)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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 new 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'. .

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## Lectures

1. [Exploring the infrared structure of massless gauge theories](https://invisiblenetwork.ai/learn/cern/3006161/40aee14eee5f), 1 h 15 min (CERN's player)