Tuesday, May 21, 2013

1305.4521 (Shinya Kanemura et al.)

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

Shinya Kanemura, Toshinori Matsui, Hiroaki Sugiyama
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.
View original: http://arxiv.org/abs/1305.4521

No comments:

Post a Comment