Description
I will discuss a tri-hypercharge extension of the Standard Model (SM) in which a separate gauged weak hypercharge is associated with each fermion family, avoiding the family repetition of the SM. Yukawa couplings for first and second family fermions arise at the non-renormalisable level, explaining the mass hierarchies observed for charged fermions along with the smallness of CKM mixing. I will show that the implementation of a seesaw type I mechanism naturally leads to a low scale seesaw, where the right-handed neutrinos may be as light as the TeV scale. Finally, the model predicts Z' bosons that could be as light as a few TeV, with implications for flavour-violating observables, LHC physics and electroweak precision observables.
Speaker
Mario Fernandez Navarro
(University of Southampton)
