7 keV Sterile neutrino dark matter in $U(1)_R-$ lepton number model

Understand

We study the phenomenology of a keV sterile neutrino in a supersymmetric model with $U(1)_R-$ lepton number in the light of a very recent observation of an X-ray line signal at around 3.5 keV, detected in the X-ray spectra of Andromeda galaxy and various galaxy clusters including the Perseus galaxy cluster.

• This model not only provides a small tree level mass to one of the active neutrinos but also renders a suitable warm dark matter candidate in the form of a sterile neutrino with negligible active-sterile mixing.
• Light neutrino masses and mixing can be explained once one-loop radiative corrections are taken into account.
• The scalar sector of this model can accommodate a Higgs boson with a mass of $\sim$ 125 GeV.