  The modest addition of the dimension-5 term lambda(H_u.H_d)^2/M to the
superpotential of the minimal supersymmetric standard model (MSSM) originated
from physics beyond the MSSM (BMSSM) has a significant impact on the scenario
of the Higgsino-dominated neutralino state being the lightest supersymmetric
particle (LSP). It increases the mass difference between the LSP and the
lighter chargino as well as that between the LSP and the second-lightest
neutralino. This enhances the LHC discovery potential of the chargino and
neutralino decays, producing more energetic charged leptons or pions than the
decays without the BMSSM corrections. Furthermore, the coannihilation between
the lighter chargino or second-lightest neutralino and the LSP is reduced
substantially such that the LSP mass does not have to be very heavy.
Consequently, an almost pure Higgsino LSP with its mass ~100 GeV in the BMSSM
can account for all the relic density of cold dark matter in the Universe
unless tan(beta) is too large.
