  We propose a Clifford algebra based model, which treats both gravity and
Yang-Mills interactions as gauge fields. There are two sectors of boson fields
as electroweak and Majorana bosons. The electroweak boson sector induces
fermion masses via spontaneous symmetry breaking. It is composed of scalar
Higgs, pseudoscalar Higgs, and antisymmetric tensor components. The Majorana
boson sector contributes to flavor mixing and Majorana masses of right-handed
neutrinos. It is comprised of neutrino Higgs and pseudo-Nambu-Goldstone bosons.
The LHC 750 GeV diphoton resonance might possibly be identified as a Majorana
sector pseudo-Nambu-Goldstone boson, which results from spontaneous symmetry
breaking of a flavor-related global U(1) symmetry involving four-fermion
condensation of right-handed leptons and quarks. The diphoton decay is loop
induced, since tree-level decay is suppressed by large Majorana mass of the
right-handed neutrino. There is also a potential dark matter candidate, which
is the four-lepton condensation of muon, muon-neutrino, tau, and tau-neutrino.
