Neutrino Mass Operators of Dimension up to Nine in Two-Higgs-doublet Model

Understand

We study higher-dimensional neutrino mass operators in a low energy theory that contains a second Higgs doublet, the two Higgs doublet model.

• The operators are relevant to underlying theories in which the lowest dimension-five mass operators would not be induced.
• We list the independent operators with dimension up to nine with the help of Young tableau.
• Also listed are the lowest dimension seven operators that involve gauge bosons and violate the lepton number by two units.