Speaker
Charlie Cresswell-Hogg
Description
Four-fermion interactions are important in many areas of particle physics, from effective descriptions of weak interactions and QCD to parametrisations of new physics in frameworks such as SMEFT. In this talk I demonstrate that four-fermion interactions may develop strongly coupled UV fixed points in four dimensional QFTs, becoming non-perturbatively renormalisable, and UV-completing themselves from the bottom up. The idea will be illustrated in a purely fermionic model of the Gross-Neveu type using the toolbox of the large-$N$ expansion.
Authors
Charlie Cresswell-Hogg
Daniel Litim
(University of Sussex)