  We consider the collider signature of right-handed neutrinos propagating in
$\delta$ (large) extra dimensions, and interacting with Standard Model fields
only through a Yukawa coupling to the left-handed neutrino and the Higgs boson.
These theories are attractive as they can explain the smallness of the neutrino
mass, as has already been shown. We show that if $\delta$ is bigger than two,
it can result in an enhancement in the production rate of the Higgs boson,
decaying either invisibly or to a $b$ anti-$b$ quark pair, associated with an
isolated high $p_T$ charged lepton and missing transverse energy at future
hadron colliders, such as the LHC. The enhancement is due to the large number
of Kaluza-Klein neutrinos produced in the final state. The observation of the
signal event would provide an opportunity to distinguish between the normal and
inverted neutrino mass hierarchies, and to determine the absolute scale of
neutrino masses by measuring the asymmetry of the observed event numbers in the
electron and muon channels.
