Abstract
Using a very minimal set of theoretical assumptions we derive a lower limit on the LSP mass in the MSSM. We only require that the LSP be the lightest neutralino, that it be responsible for the observed relic density and that the MSSM spectrum respect the LEP2 limits. We explicitly do not require any further knowledge about the MSSM spectrum or the mechanism of supersymmetry breaking. Under these assumptions we determine a firm lower limit on the neutralino LSP mass of 18 GeV. We estimate the effect of improved limits on the cold dark matter relic density as well as the effects of improved LEP2-type limits from a first stage of TESLA on the allowed range of neutralino LSP masses.
Highlights
One of the most puzzling experimental observations in astrophysics has for a long time been the dominance of the invisible cold dark matter in the universe
Being inspired by flavor physics constraints, this R symmetry has a huge impact on astrophysics: it leads to the existence of a stable lightest supersymmetric particle (LSP)
If supersymmetry is to provide us with a suitable dark matter candidate, we can say some things about the nature of the LSP
Summary
One of the most puzzling experimental observations in astrophysics has for a long time been the dominance of the invisible cold dark matter in the universe. Cosmic microwave background studies and large scale structure formation requires that the majority of the dark matter be cold (non-relativistic) [1,6]. The mass of a light Higgs boson in the Standard Model is not stable in perturbation theory, but this mass hierarchy problem can be naturally solved by adding supersymmetry to the gauge symmetries on which the Standard Model is based. Being inspired by flavor physics constraints, this R symmetry has a huge impact on astrophysics: it leads to the existence of a stable lightest supersymmetric particle (LSP). One possible experimental signature of LSPs with masses of the order of the weak scale could be the measured amount of cold dark matter. In the MSSM the existence of the LSP is not at all ad-hoc but the natural consequence of flavor physics constraints
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