DETECTING INVISIBLE HIGGS BOSONS AT CERN LARGE HADRON COLLIDER

In some extensions of the standard model the (lightest) Higgs boson can have mainly invisible decays, decaying to a pair of the lightest supersymmetric patners, or to Goldstone bosons, or to Majorons, none of which interact in the detector. Thus it is not clear how such a Higgs boson can be detected. We show that associated production of such Higgs bosons with Z's at high-luminosity hadron colliders can provide a detectable signal for the mass region of most interest, M(h) less-than-or-equal-to 150 GeV. If a Higgs boson is detected another way, so that M(h) is known, this method may allow a measurement of the branching ratio (B) (h --> invisible), and may also allow measurement of other branching ratios.