Alternative minimal U(1)B−L

Abstract

We provide a minimal alternative gauged U(1)B−L model in which three right-handed neutrinos with charges of (5,−4,−4) and only one B−L Higgs field with charge 1 are introduced. Consistent active neutrino masses and mixings can be obtained if the Z2 symmetry on two of the right-handed neutrinos is introduced. It predicts two heavy degenerate right-handed neutrinos, which may realize resonant leptogenesis scenario, and one relatively light sterile neutrino, which is a good dark matter candidate.