Nonstandard Higgs Decays and Dark Matter in the E6SSM
  We study the decays of the lightest Higgs boson within the exceptional
supersymmetric (SUSY) standard model (E6SSM). The E6SSM predicts three families
of Higgs-like doublets plus three SM singlets that carry U(1)_{N} charges. One
family of Higgs-like doublets and one SM singlet develop vacuum expectation
values. The fermionic partners of other Higgs-like fields and SM singlets form
inert neutralino and chargino states. Two lightest inert neutralinos tend to be
the lightest and next-to-lightest SUSY particles (LSP and NLSP). The considered
model can account for the dark matter relic abundance if the lightest inert
neutralino has mass close to half the Z mass. In this case the usual SM-like
Higgs boson decays more than 95% of the time into either LSPs or NLSPs. As a
result the decays of the lightest Higgs boson into l^{+} l^{-} + X might play
an essential role in the Higgs searches. This scenario also predicts other
light inert chargino and neutralino states below 200 GeV and large LSP direct
detection cross-sections which is on the edge of observability of XENON100.
