Right-handed sneutrino as cold dark matter of the Universe

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.065001· OSTI ID:21020180

Asaka, Takehiko ^[1]; Ishiwata, Koji; Moroi, Takeo ^[2]

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1. Institut de Theorie des Phenomenes Physiques, EPFL, CH-1015 Lausanne (Switzerland)
2. 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, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
NEUTRINOS
NONLUMINOUS MATTER
NUCLEOSYNTHESIS
OSCILLATIONS
PARTICLE DECAY
SPACE
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY
UNIVERSE