Loop Suppression of Dirac Neutrino Mass in the Neutrinophilic Two Higgs Doublet Model

Shinya Kanemura (Toyama U.) , Toshinori Matsui (Toyama U.) , Hiroaki Sugiyama (Kyoto Sangyo U.)

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classification ✦ hep-ph

keywords modelneutrinophilicscalarneutrinosdiracdoubletfieldhiggs

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We extend the scalar sector of the neutrinophilic two Higgs doublet model, where small masses of Dirac neutrinos are obtained via a small vacuum expectation value v_nu of the neutrinophilic SU(2)_L-doublet scalar field which has a Yukawa interaction with only right-handed neutrinos. A global U(1)_X symmetry is used for the neutrinophilic nature of the second SU(2)_L-doublet scalar field and also for eliminating Majorana mass terms of neutrinos. By virtue of an appropriate assignment of the U(1)_X-charges to new particles, our model has an unbroken Z_2 symmetry, under which the lightest Z_2-odd scalar boson can be a dark matter candidate. In our model, v_nu is generated by the one-loop diagram to which Z_2-odd particles contribute. We briefly discuss a possible signature of our model at the LHC.

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