Neutrino Masses from Loop-Induced Dirac Yukawa Couplings

Details Neutrino Masses from Loop-Induced Dirac Yukawa Couplings Neutrino Masses from Loop-Induced Dirac Yukawa Couplings

2011-06-13

arxiv.org/abs/1106.2480v1

Phys. Lett. B703:66-70, 2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 1 figure

Scientific paper

10.1016/j.physletb.2011.07.047

We consider a possibility to naturally explain tiny neutrino masses without the lepton number violation. We study a simple model with SU(2)_L singlet charged scalars (s_1^+, s_2^+) as well as singlet right-handed neutrino (nu_R). Yukawa interactions for Dirac neutrinos, which are forbidden at the tree level by a softly-broken Z_2 symmetry, are induced at the one-loop level via the soft-breaking term in the scalar potential. Consequently neutrinos obtain small Dirac masses after the electroweak symmetry breaking. It is found that constrains from neutrino oscillation measurements and lepton flavor violation search results (especially for mu to e gamma) can be satisfied. We study the decay pattern of the singlet charged scalars, which could be tested at the LHC and the ILC. We discuss possible extensions also, e.g. to introduce dark matter candidate.

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