Two-loop Dirac neutrino mass and WIMP dark matter

Abstract

We propose a "scotogenic" mechanism relating small neutrino mass and cosmological dark matter. Neutrinos are Dirac fermions with masses arising only in two--loop order through the sector responsible for dark matter. Two triality symmetries ensure both dark matter stability and strict lepton number conservation at higher orders. A global spontaneously broken U(1) symmetry leads to a physical $Diracon$ that induces invisible Higgs decays which add up to the Higgs to dark matter mode. This enhances sensitivities to spin-independent WIMP dark matter search below $m_h/2$.

11 pages, 3 figures; references added, Fig. 3 updated to include recent limits reported by LUX and PandaX. Version to appear in Phys. Lett. B

References in corpus (5)

• Dark Matter Results from First 98.7-day Data of PandaX-II Experiment
• Observing the Dark Scalar Doublet and its Impact on the Standard-Model Higgs Boson at Colliders
• Cold Dark Matter, Radiative Neutrino Mass, mu to e gamma, and Neutrinoless Double Beta Decay
• Z_3 Dark Matter and Two-Loop Neutrino Mass
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• Scotogenic $U(1{)}_{\chi }$ Dirac Neutrinos
• Improved bounds on ${\mathbb{Z}}_3$ singlet dark matter
• Two-loop Induced Majorana Neutrino Mass in a Radiatively Induced Quark and Lepton Mass Model
• The role of residual symmetries in dark matter stability and the neutrino nature
• Self-interacting Dark Matter with Scalar Dilepton Mediator
• Theory and phenomenology of Dirac neutrinos