Dark matter in the light of LEP

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Scientific paper

LEP constraints suggest that cold matter particle candidates must be heavier than previously favoured. The LEP limit on Z0-->invisible neutrals implies that any Majorana fermions annihilating via the Z0 to give the critical closure density must weigh more than about 14 GeV, if the present Hubble expansion rate is 50, km s-1 Mpc-1, a limit which can rise to about 19 GeV for Dirac fermions when underground 76Ge experiments are taken into account. It is pointed out that in both the Dirac and Majorana cases the Z0 couplings must be weaker than those of neutrinos, unless the masses exceed ~1/2mz. These arguments on mass and interaction strength should be considered in future dark matter searches. We exemplify these generic arguments by identifying regions of parameter space in the minimal supersymmetric extension of the standard model where the lightest supersymmetric particle (LSP) can have the critical density. In some of these regions the LSP is mainly a higgsino and its mass much larger than the Majorana fermion bound mentioned above. In other regions the LSP is mainly a gaugino, in which case mLSP>~20 GeV.
On leave of absence from University of Chicago, Chicago, IL 60637, USA and NASA/Fermilab Astrophysics Center, Batavia, IL 60510, USA.

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