Gauge Origin of Baryon Number Conservation and Suppressed Neutrino Masses From Five Dimensions

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We consider a 5D SUSY SU(3)c× SU(2)ₗ× U(1)Y× U(1) model compactified on an S⁽¹⁾/Z₂ orbifold. To cancel anomalies arising from the presence of U(1), we employ a Chern-Simons term and also chiral fields which could reside on the brane or in the bulk depending on the model. The presence of U(1) symmetry leads to baryon number conservation, gives rise to matter parity, and permits satisfactory neutrino masses and mixings even for a low fundamental scale. The brane Fayet-Iliopoulos D-terms naturally break U(1), leaving N=1 SUSY unbroken in 4 dimensions.