# A non-perturbative mechanism for fermion mass generation

#### A non-perturbative mechanism for fermion mass generation

- Event time: 2:00pm
- Event date: 22nd January 2020
- Speaker: Professor Giancarlo Rossi (Universita' di Roma "Tor Vergata")
- Location: Higgs Centre Seminar Room, Room 4305, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

In this talk I present (numerical) evidence for the existence of a field-theoretical mechanism that can provide mass to fermions in models with fermions, non-abelian gauge fields and scalars, where chiral symmetry is broken at the cutoff level by some irrelevant term, provided the model parameters are tuned to critical values at which chiral symmetry is maximally restored. We show that in the Nambu-Goldstone phase of the critical model fermions acquire a non-perturbative mass of the order of the RGI scale of the theory times powers of the coupling constant of the gauge interaction the fermion is subjected to and independent of the scalar vev. The peculiar structure of this mass term 1) suggests the existence of a super-strong non-abelian sector at the (multi)TeV scale as, in order to have the top mass at its physical value, the RGI scale of the theory must be much larger than $\Lambda_{QCD}$, 2) it suggests that the fermion mass hierarchy is a consequence of the different strength of the interaction the particles feel.

#### Event resources

### About Particle Physics Theory seminars

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..