Light Sterile Neutrino and Dark Matter in Left-Right Symmetric Models Without Higgs Bidoublet

Understand

We present a class of left-right symmetric models where Dirac as well as Majorana mass terms of neutrinos can arise at one-loop level in a scotogenic fashion: with dark matter particles going inside the loop.

• We show the possibility of naturally light right handed neutrinos that can have interesting implications at neutrinoless double beta decay experiments as well as cosmology.
• Apart from a stable dark matter candidate stabilised by a remnant $Z_2$ symmetry, one can also have a long lived keV sterile neutrino dark matter in these models.
• This class of models can have very different collider signatures compared to the conventional left-right models.