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

Abstract

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. In this model gravitino is the lightest supersymmetric particle (LSP) and we also study the cosmological implications of this light gravitino with mass $\sim \mathcal{O}$(GeV).

arXiv commentV2, minor modifications in the text, references added, published in JHEP

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• Explaining the 3.5 keV X-ray Line in a $L_{\mu }-L_{\tau }$ Extension of the Inert Doublet Model
• Displaced Vertices from X-ray Lines
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• Common Origin of 3.55 keV X-Ray Line and Galactic Center Gamma Ray Excess in a Radiative Neutrino Mass Model
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• $h\to \gamma \gamma$ in $U(1{)}_R-$ lepton number model with a right-handed neutrino
• Natural emergence of neutrino masses and dark matter from $R$-symmetry
• Common Origin of $3.55$ keV X-ray line and Gauge Coupling Unification with Left-Right Dark Matter
• X-ray lines and self-interacting dark matter
• Anomalous X-Ray Galactic signal from 7 keV spin-$3/2$ dark matter decay
• Light top squarks in $U(1{)}_R$-lepton number model with a right handed neutrino and the LHC
• Charting generalized supersoft supersymmetry
• $0\nu \beta \beta$ in left-right theories with Higgs doublets and gauge coupling unification
• 3.5 keV X-ray Line Signal from Dark Matter Decay in Local $U(1{)}_{B-L}$ Extension of Zee-Babu Model
• Supersymmetric Higgs-portal and X-ray lines