Monojets From Family Unification

Abstract
Any model in which the neutrino mass matrix violates the Glashow-Iliopoulos-Maiani mechanism can give monojets. The Z can decay into one heavy and one light neutrino, with the heavier neutrino decaying into a jet. If the heavier neutrino is sufficiently light, this mechanism has not been ruled out by recent searches at PEP and PETRA for monojet signatures. Such monojets arise naturally in the SO(18) model of family unification. In this model we predict additional unusual events, which result from the purely leptonic decay of the heavier neutrino.