# Evidence for the dynamical generation of naturally light fermion masses

#### Evidence for the dynamical generation of naturally light fermion masses

- Event time: 2:00pm
- Event date: 9th May 2018
- Speaker: Professor Giancarlo Rossi (Universita' di Roma "Tor Vergata")
- Location: Higgs Centre Seminar Room, 4305 James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

We present a numerical study of a model where a $SU(2)$ doublet of non-abelian strongly interacting fermions is coupled to a complex scalar field doublet via a Yukawa and an irrelevant Wilson-like term. Despite the presence of these two chiral breaking operators in the Lagrangian, an exact symmetry, acting on all fields, prevents UV power divergent fermion mass corrections. In the phase where fermions are massless (Wigner phase) the Yukawa coupling can be set at a critical value where fermion chiral transformations become symmetries of the theory (up to cutoff effects). Numerical simulations of the critical theory in the Nambu-Goldstone phase give evidence for the non-perturbative generation of a UV finite fermion mass term. We shall elaborate on possible consequences of exploiting this dynamical mass generation phenomenon as an alternative to the Higgs mechanism.

### 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..