Abstract
In the type-II seesaw mechanism, the neutrino mass generation could be tested experimentally if the Higgs triplet is at the TeV scale and has a small cubic coupling to the standard model Higgs doublet. We show such small triplet-doublet coupling and the cosmic baryon asymmetry can be simultaneously induced by an additional seesaw mechanism involving a $U(1)_{B-L}$ gauge symmetry. Meanwhile, three neutral fermions for cancelling the gauge anomalies can form a stable Dirac fermionic dark matter besides an acceptably massless fermion.
Highlights
The atmospheric, solar, accelerator, and reactor neutrino experiments have established the phenomenon of neutrino oscillations
We show such small triplet-doublet coupling and the cosmic baryon asymmetry can be simultaneously induced by an additional seesaw mechanism involving a Uð1ÞB−L gauge symmetry
In this paper we have shown a Uð1ÞB−L gauge symmetry can provide the lepton number violation for the Majorana neutrino mass generation, can predict the existence and guarantee the stability of the dark matter
Summary
The atmospheric, solar, accelerator, and reactor neutrino experiments have established the phenomenon of neutrino oscillations. In this paper we shall realize a double type II seesaw mechanism by resorting to a Uð1ÞB−L gauge symmetry which forbids the Yukawa couplings of three right-handed neutrinos to the SM Through their Yukawa couplings to a Higgs singlet for spontaneously breaking the Uð1ÞB−L symmetry, the right-handed neutrinos eventually can form a Dirac fermion to become a stable dark matter particle besides a harmlessly massless state. Because of this Uð1ÞB−L symmetry breaking, two or more heavy Higgs singlets can acquire their small VEVs to suppress the cubic coupling between the usual type II seesaw Higgs triplet and the SM Higgs doublet. Our model can accommodate a successful leptogenesis mechanism through the heavy Higgs singlet decays
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