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We consider an extension of the standard electroweak model with three Higgs doublets and global $B-L$ and $mathbb{Z}_2$ symmetries. Two of the scalar doublets are inert due to the $mathbb{Z}_2$ symmetry. We calculated all the mass spectra in the scalar and lepton sectors and accommodate the leptonic mixing matrix as well. We also include an analysis of the scalar sector, showing that the potential is limited from below, and we obtain the masses of the scalar sector. Furthermore we consider the effects of the model on the anaomalous magnetic dipole of charged leptons and the $muto egamma$ decay. We also present the SUSY version of the model with global $B-L$.
We consider an Supersymmetric extension of the Standard Model with some extra Higgs doublets and a global $(B - L)$, where $B$ and $L$ are the usual baryonic and lepton number respectivelly, and ${cal Z}_{3} otimes {cal Z}^{prime}_{3}$ symmetries of the non-SUSY model presented at [1]..
Several models of neutrino masses predict the existence of neutral heavy leptons. Here, we review current constraints on heavy neutrinos and apply a new formalism separating new physics from Standard Model. We discuss also the indirect effect of extra heavy neutrinos in oscillation experiments.
In a supersymmetric model, the presence of a right handed neutrino with a large Yukawa coupling $f_{ u}$ would affect slepton masses via its contribution to the renormalization group evolution between the grand unification and weak scales. Assuming a
We consider the possibility of having a MeV right-handed neutrino as a dark matter constituent. The initial reason for this study was the 511 keV spectral line observed by the satellite experiment INTEGRAL: could it be due to an interaction between d
We study the equilibration of the right-helicity states of light Dirac neutrinos in the early universe by solving the momentum dependent Boltzmann equations numerically. We show that the main effect is due to electroweak gauge boson poles, which enha