PT Journal
AU Addazi, A
   Valle, JWF
   Vaquera-Araujo, CA
TI String completion of an SU(3)(c) x SU(3)(L) x U(1)(X) electroweak model
SO Physics Letters B
JI Phys. Lett. B
PY 2016
BP 471
EP 478
VL 759
DI 10.1016/j.physletb.2016.06.015
LA English
DE Unification; Branes; String phenomenology; Neutrino mass; Neutron-antineutron oscillations
AB The extended electroweak SU(3)(c) circle times SU(3)(L) circle times U(1)(X) symmetry framework "explaining" the number of fermion families is revisited. While 331-based schemes can not easily be unified within the conventional field theory sense, we show how to do it within an approach based on D-branes and (un)oriented open strings, on Calabi-Yau singularities. We show how the theory can be UV-completed in a quiver setup, free of gauge and string anomalies. Lepton and baryon numbers are perturbatively conserved, so neutrinos are Dirac-type, and their lightness results from a novel TeV scale seesaw mechanism. Dynamical violation of baryon number by exotic instantons could induce neutron-antineutron oscillations, with proton decay and other dangerous R-parity violating processes strictly forbidden. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.
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