Hunting for Hierarchies in $\mathcal{PSL}_2(7)$

por Dr. Michael Jay Pérez (Dept. Física Teòrica/IFIC, Univ. València-CSIC)

jueves 29 oct. 2015 12:00 → 13:00 Europe/Madrid

4-4-4426 - Seminari Física Teòrica (Campus Burjassot)

We present a model with the family group $\mathcal{PSL}_2(7)$ wherein the top quark hierarchy, through SO(10) and the Seesaw mechanism, is mapped onto the vacuum values of familon fields and transferred to the ΔIw=0 parameters of the νMSSM: the right-handed neutrino Majorana mass  and the μ term. It predicts tribimaximal mixing, and a normal hierarchy for the light neutrinos. The familon vacuum is used to derive the supersymmetric μ-masses of Higgs fields with family quantum numbers, as well as the Yukawa matrices of the quarks and leptons. We find, through the magic of $\mathcal{PSL}_2(7)$ invariants, a μ-matrix with a hierarchy of thirteen orders of magnitude. Only one Higgs field (per hypercharge sector) is light enough (with a μ-mass ∼10−100 GeV) to be destabilized by SUSY soft breaking at the TeV scale. Remarkably, their vacuum values generate unsupressed masses only for t, b, and τ.