Mirror symmetry: from active and sterile neutrino masses to baryonic and dark matter asymmetries Original Research Article

We consider an image mirror sector where the field content and dimensionless couplings are a copy of the image ordinary sector. Our model also contains three gauge-singlet fermions with heavy Majorana masses and an image-bidoublet Higgs scalar with seesaw-suppressed vacuum expectation value. The mirror sterile neutrino masses will have a form of canonical seesaw while the ordinary active neutrino masses will have a form of double and linear seesaw. In this canonical and double-linear seesaw scenario, we can expect one sterile neutrino at the eV scale and the other two above the MeV scale to fit the cosmological and short baseline neutrino oscillation data. Associated with the image and image sphaleron processes, the decays of the fermion singlets can simultaneously generate a lepton asymmetry in the image-doublet leptons and an equal lepton asymmetry in the image-doublet leptons to explain the existence of baryonic and dark matter. The lightest mirror baryon then should have a determined mass around image to account for the dark matter relic density. The image kinetic mixing can open a window for dark matter direct detection.