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An extension of the Standard Model (SM) is studied in which two right-handed(RH) neutrinos per generation are incorporated, but considering the hypothesisof the symmetry of lepton and quark contents in order to deprive the number ofRH neutrinos of freedom, generate Dirac neutrinos and accommodate naturallytiny values for their masses. The high scale type-I seesaw regime is applied tothe first, ordinary RH neutrino, whereas a low scale pseudo-Dirac scenario isused for the second, adulterant RH neutrino, implying that the first RHneutrino decouples at the high scale, while the second RH neutrino survivesdown to the low scale to pair off in a Dirac-like form with the correspondingleft-handed (LH) neutrino. The small mass and couplings of this extra RHneutrino are explained by means of the statement of the symmetry of fermioniccontent, only regarded as a guideline to the natural choice of parameters sinceit is not a proper symmetry in the Lagrangian.

Neutrino mass generation with extra right-handed fields in a Dirac scenario via the type-I seesaw mechanism