Right-handed sneutrino as cold dark matter of the Universe
- Institut de Theorie des Phenomenes Physiques, EPFL, CH-1015 Lausanne (Switzerland)
- Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
We consider the minimal supersymmetric standard model (MSSM) extended by introducing three right-handed (s)neutrinos to account for neutrino masses in the oscillation experiments. Assuming that the neutrino masses are purely Dirac type, the lightest right-handed sneutrino {nu}-tilde{sub R} can be the lightest superparticle (LSP), which is a good candidate of cold dark matter (CDM) of the Universe. We study the possibility of realizing {nu}-tilde{sub R}-CDM, paying special attention to the production of {nu}-tilde{sub R} via decay of the next-to-lightest superparticle after its freeze-out time. It is shown that the late decay of the MSSM-LSP (the LSP among superparticles in the MSSM) can produce a sufficient amount of {nu}-tilde{sub R} to explain the observed dark matter density, and that the {nu}-tilde{sub R}-CDM scenario can be realized in a wide range of parameter space. We also consider the constraint on the decay of MSSM-LSP from the big bang nucleosynthesis; we found that the case with stau being the MSSM-LSP is severely constrained.
- OSTI ID:
- 21020180
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 75, Issue 6; Other Information: DOI: 10.1103/PhysRevD.75.065001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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