An SU(2)_L x SU(2)_R x U(1)_{B-L} model with two or three scalar bidoublets and two doublets keeps neutrinos Dirac and aims to remove the small-mass fine-tuning with a third bidoublet.
Scalar Dark Matter Candidates in Two Inert Higgs Doublet Model
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abstract
We study a two scalar inert doublet model (IDMS$_3$) which is stabilized by a $S_3$ symmetry. We consider two scenarios: i) two of the scalars in each charged sector are mass degenerated due to a residual $Z_2$ symmetry, ii) there is no mass degeneracy because of the introduction of soft terms that break the $Z_2$ symmetry. We show that both scenarios provide good dark matter candidates for some range of parameters.
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Dirac neutrinos in a $SU(2)$ left-right symmetric model
An SU(2)_L x SU(2)_R x U(1)_{B-L} model with two or three scalar bidoublets and two doublets keeps neutrinos Dirac and aims to remove the small-mass fine-tuning with a third bidoublet.