String completion of an SU(3)_c ⊗ SU(3)_L ⊗ U(1)_X electroweak model

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• 作者：Andrea Addazi^a ; ^b ; ^{andrea.addazi@infn.lngs.it" class="auth_mail" title="E-mail the corresponding author} ; J.W.F. Valle^c ; ^{valle@ific.uv.es" class="auth_mail" title="E-mail the corresponding author} ; C.A. Vaquera-Araujo^c ; ^{vaquera@ific.uv.es" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Unification ; Branes ; String phenomenology ; Neutrino mass ; Neutron&ndash ; antineutron oscillations
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 August 2016
• 年：2016
• 卷：759
• 期：Complete
• 页码：471-478
• 全文大小：321 K

文摘

The extended electroweak SU(3)_c⊗SU(3)_L⊗U(1)_X$\mathrm{S}\mathrm{U}{(\mathrm{3})}_{\mathrm{c}}\otimes \mathrm{S}\mathrm{U}{(\mathrm{3})}_{\mathrm{L}}\otimes \mathrm{U}{(\mathrm{1})}_{\mathrm{X}}$ 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.