Heavy triplet neutrinos as a new dark-matter option

Details Heavy triplet neutrinos as a new dark-matter option Heavy triplet neutrinos as a new dark-matter option

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993nuphb.394...35c&link_type=abstract

Nuclear Physics B, Volume 394, Issue 1, p. 35-72.

Physics

Nuclear Physics

2

Scientific paper

We propose a new scheme where dark matter is made of heavy stable neutral particles N, possibly even lighter than 1/2mZ, but uncoupled to the Z0. Such particles should be given an efficient way to annihilate, otherwise their fossil density would overclose the universe. In this scheme, the annihilation results from a delicate interplay between N and its heavier charged electroweak partner E+/-. A closure density may be naturally reached if the mass splitting is ~10 GeV, which suggests that the E+/- may be discovered at LEP 200. The species N results from the mixing between a singlet and the neutral member of a triplet, here induced by the vacuum expectation value of a Higgs triplet. The latter is kept naturally small with respect to the electroweak scale, as a result of a new approximate discrete symmetry, the triplet-parity Tp. We discuss various implications of this model for astrophysics and particle physics.
Unité propre de Recherche du CNRS, associée à l'Ecole Normale Supérieure et à l'Université de Paris-Sud.

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