# Fermion-Monopole Scattering and Generalized Symmetries

- Institution: CERN
- Department: TH String Theory Seminar
- Speaker: Marieke Van Beest
- Year: 2024
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3003749)
- 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)

I will discuss the problem of electrically charged, massless fermions scattering off magnetic monopoles. The interpretation of the outgoing states has long been a puzzle, as they can carry fractional quantum numbers. I will argue that such outgoing particles live in the twisted sector of a topological co-dimension 1 surface, which ends on the monopole. This leads to new predictions for the outgoing state in QED as well as the Standard Model. The surface is often non-invertible, and as such the outgoing radiation not only carries unconventional flavor quantum numbers, but is often trailed by a topological field theory. .

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## Lectures

1. [Fermion-Monopole Scattering and Generalized Symmetries](https://invisiblenetwork.ai/learn/cern/3003749/17e555bb5e26), 1 h 3 min (CERN's player)