Unification without SUSY: neutrino mass,  proton decay and light leptoquarks

by Pavel Fileviez Perez (IST, Lisboa)

Friday 16 Sept 2005, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

I discuss predictions of a minimal realistic non-supersymmetric grand unified theory based on the SU(5) gauge group. To accomplish unification and generate neutrino mass we introduce one extra Higgs representation -- a 15 of SU(5) -- to the particle content of the minimal Georgi--Glashow scenario. I will show that generic prediction of this setup is a set of rather light scalar leptoquarks. Their masses are in the phenomenologically interesting region (O(10²-10³) GeV) in the case of the most natural implementa-tion of the type II see-saw mechanism for neutrino masses. Therefore, our GUT scenario has a potential to be tested at the next generation of collider experiments, particularly at the Large Hadron Collider (LHC) at CERN. It is shown that this model can be also tested or ruled out at the next generation of proton decay experiments.