Abstract
We consider the minimal supersymmetric standard model (MSSM) extended by three right-handed neutrinos. Assuming that neutrino masses are purely Dirac-type, the lightest right-handed sneutrino ν̃R can be the lightest superparticle (LSP). We discuss the possibility that the LSP ν̃R becomes dark matter of the universe, paying attention to the production of ν̃R in the early universe. This work is based on collaboration with K. Ishiwata and T. Moroi [1, 2].
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