Lightest Supersymmetric Particle
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In particle physics, the Lightest Supersymmetric Particle is the generic name given to the lightest of the additional hypothetical particles found in supersymmetric models. In models with R-parity conservation, the LSP is stable. There is extensive observational evidence for an additional component of the matter density in the Universe that goes under the name dark matter. The LSP of supersymmetric models is a dark matter candidate and is a Weakly interacting massive particle.Dark matter particles must be electrically neutral; otherwise they would scatter light and thus not be "dark". They…mehr

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In particle physics, the Lightest Supersymmetric Particle is the generic name given to the lightest of the additional hypothetical particles found in supersymmetric models. In models with R-parity conservation, the LSP is stable. There is extensive observational evidence for an additional component of the matter density in the Universe that goes under the name dark matter. The LSP of supersymmetric models is a dark matter candidate and is a Weakly interacting massive particle.Dark matter particles must be electrically neutral; otherwise they would scatter light and thus not be "dark". They must also almost certainly be non-colored. With these constraints, the LSP could be the lightest neutralino, the gravitino, or the lightest sneutrino.Sneutrino dark matter is ruled out in the Minimal Supersymmetric Standard Model because of the current limits on the interaction cross section of dark matter particles with ordinary matter as measured by direct detection experiments -- the sneutrino interacts via Z boson exchange and would have been detected by now if it makes up the dark matter.