Speaker
Mr
Marco Garofalo
(University of Edinburgh)
Description
We consider a field theoretical model where a SU(2) doublet fermion, subjected to non-abelian gauge interactions, is also 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 fermions and scalars prevents perturbative mass corrections. In the phase where fermions are massless (Wigner phase) the Yukawa coupling can be tuned to a critical value at which chiral transformations acting on fermions only become a symmetry of the theory (up to cutoff effects). In the Nambu-Goldstone phase of the critical theory a fermion mass term of dynamical origin is expected to arise in the Ward identities of the purely fermionic chiral transformations. Such a non-perturbative mechanism of dynamical mass generation can provide a “natural" (a` la 't Hooft) alternative to the Higgs mechanism adopted in the Standard Model.
Primary author
Mr
Marco Garofalo
(University of Edinburgh)
Co-authors
Mr
Bartosz Kostrzewa
(HISKP (Theory), Universitaet Bonn)
Dr
Bastian Knippschild
(HISKP (Theory), Universitaet Bonn)
Prof.
Carsten URBACH
(HISKP (Theory), Universitaet Bonn)
Prof.
Giancarlo Rossi
(University of Rome Tor Vergata, Physics Department and INFN - Sezione di Roma Tor Vergata)
Dr
Giulia Maria De Divitiis
(University of Rome Tor Vergata, Physics Department and INFN - Sezione di Roma Tor Vergata)
Dr
Konstantin ottnad
(HISKP (Theory), Universitaet Bonn)
Dr
Mario SCHRÖCK
(Università di Roma Tre, INFN)
Dr
Petros Dimopoulos
(Centro Fermi, Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi")
Prof.
Roberto Frezzotti
(University of Rome Tor Vergata, Physics Department and INFN - Sezione di Roma Tor Vergata)
Dr
Stefano Capitani
(University of Frankfurt)
