Abstract
We construct the one-loop and two-loop scotogenic models for Dirac neutrino mass generation in the context of U(1)_{B-L} extensions of standard model. It is indicated that the total number of intermediate fermion singlets is uniquely fixed by the anomaly free condition and the new particles may have exotic B-L charges so that the direct SM Yukawa mass term bar{nu }_Lnu _Roverline{phi ^0} and the Majorana mass term (m_N/2)overline{nu _R^C}nu _R are naturally forbidden. After the spontaneous breaking of the U(1)_{B-L} symmetry, the discrete Z_{2} or Z_{3} symmetry appears as the residual symmetry and gives rise to the stability of intermediate fields as DM candidates. Phenomenological aspects of lepton flavor violation, DM, leptogenesis and LHC signatures are discussed.
Highlights
On the other hand, the evidence establishing whether neutrinos are Majorana or Dirac fermions is still missing
The Dirac nature of neutrinos is protected by B−L symmetry, while the dark matter (DM) stability is guaranteed by the residual symmetry of B − L spontaneous symmetry breaking (SSB)
We first present the topological diagrams of one-loop Z2 realizations and subsequently check their validity under the anomaly free condition
Summary
The evidence establishing whether neutrinos are Majorana or Dirac fermions is still missing. Several efforts were made at tree level [55,58,59,60], and a specific one-loop realization was proposed based on a left–right symmetry scheme [52] In this brief article, we propose the U (1)B−L extensions of scotogenic Dirac neutrino mass models with intermediate Dirac fermion singlets. C (2017) 77:889 one- and two-loop realizations for Dirac neutrino masses with typical topographies, respectively In these models, a singlet scalar σ is responsible for the SSB of the gauged U (1)B−L symmetry as well as the masses of the heavy intermediate Dirac fermions. 2, we construct the one/two-loop diagrams for Dirac neutrino mass generation and discuss their validity under the B − L anomaly free condition.
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