Right-Handed Sneutrino as Cold Dark Matter of the Universe

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dc.creatorAsaka, Takehiko
dc.creatorIshiwata, Koji
dc.creatorMoroi, Takeo
dc.date2006-12-18
dc.date.accessioned2026-07-07T11:22:21Z
dc.date.available2026-07-07T11:22:21Z
dc.descriptionWe 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 $\tilde ν_R$ 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 $\tilde ν_R$-CDM, paying a special attention to the production of $\tilde ν_R$ via decay of the next-to-lightest superparticle (NLSP) 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 $\tilde ν_R$ to explain the observed dark-matter density, and that the $\tilde ν_R$-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 (BBN); we found that the case with stau being the MSSM-LSP is severely constrained.
dc.description13 pages, 15 figures, revtex4
dc.identifierhttps://arxiv.org/abs/hep-ph/0612211
dc.identifierhttp://arxiv.org/abs/hep-ph/0612211
dc.identifierPhys.Rev.D75:065001,2007
dc.identifierdoi:10.1103/PhysRevD.75.065001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194542
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleRight-Handed Sneutrino as Cold Dark Matter of the Universe
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