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High Energy Physics - Theory, hep-th,High Energy Physics - Phenomenology, hep-ph
Abstract:
In a scheme originally proposed by M. Gell-Mann, and subsequently shown to be
realized at the SU(3)xU(1) stationary point of maximal gauged SO(8)
supergravity by N. Warner and one of the present authors, the 48 spin 1/2
fermions of the theory remaining after the removal of eight Goldstinos can be
identified with the 48 quarks and leptons (including right-chiral neutrinos) of
the Standard Model, provided one identifies the residual SU(3) with the
diagonal subgroup of the color group SU(3)_c and a family symmetry SU(3)_f.
However, there remained a systematic mismatch in the electric charges by a
spurion charge of $\pm$1/6. We here identify the `missing' U(1) that rectifies
this mismatch, and that takes a surprisingly simple, though unexpected form.
