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arXiv · 1807.04964

Right sneutrino with $Δ\,L\,=\,2$ masses as non-thermal dark matter

Avirup Ghosh·Tanmoy Mondal·Biswarup Mukhopadhyaya
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Abstract

We consider MSSM with right-chiral neutrino superfields with Majorana masses, where the lightest right-handed sneutrino dominated scalars constitutes non-thermal dark matter (DM). The $Δ\,L=2$ masses are subject to severe constraints coming from freeze-in relic density of such DM candidates as well as from sterile neutrino $\textit{freeze-in}$. In addition, big-bang Nucleosynthesis and $\textit{freeze-out}$ of the next-to-lightest superparticle shrink the viable parameter space of such a scenario. We examine various $Δ\,L=2$ mass terms for families other than that $Δ\,L=2$ masses are difficult to reconcile with a right-sneutrino DM, unless there is either (a) a hierarchy of about 3 orders of magnitudes among various supersymmetry-breaking mass parameters, or, (b) strong cancellation between the higgsino mass and the trilinear supersymmetry breaking mass parameter for sneutrinos.

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Avirup Ghosh, Tanmoy Mondal, Biswarup Mukhopadhyaya. 2019-02-23. Right sneutrino with $Δ\,L\,=\,2$ masses as non-thermal dark matter. https://doi.org/10.1103/physrevd.99.035018

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