  The lightest supersymmetric particle (LSP) is a natural candidate for the
cold dark matter of the universe. In this Letter we discuss how to test the
mechanism responsible for the LSP stability at the LHC. We note that if
R-parity is conserved dynamically one should expect a Higgs boson which decays
mainly into two right-handed neutrinos (a "leptonic" Higgs) or into two
sfermions. The first case could exhibit spectacular lepton number violating
signals with four secondary vertices due to the long-lived nature of
right-handed neutrinos. These signals, together with the standard channels for
the discovery of SUSY, could help to establish the underlying theory at the TeV
scale.

High Energy Physics - Phenomenology