  The lightest srpersymmetric particle (LSP) is expected to be stable, massive
and neutral. Direct searches for supersymmetric particles in the context of the
minimal supersymmetric extension to the standard model have been performed with
the ALEPH detector. Using about 175pb-1 of data with centre-of-mass energies
near 189GeV a limit on the mass of the LSP of M_LSP>32.3GeV/c2 at 95%
confidence can be derived, assuming R-parity is conserved.
