Search for invisibly decaying Higgs bosons in e+e- -> Zoho production at sqrt(s) = 183 - 209 GeV

Understand

A search is performed for Higgs bosons decaying into invisible final states, produced in association with a Zo boson in e+e- collisions at energies between 183 and 209 GeV.

• The search is based on data samples collected by the OPAL detector at LEP corresponding to an integrated luminosity of about 660 pb-1.
• The analysis aims to select events containing the hadronic decay products of the Zo boson and large missing momentum, as expected from Higgs boson decay into a pair of stable weakly interacting neutral particles, such as the lightest neutralino in the Minimal Supersymmetric Standard Model.
• The same analysis is applied to a search for nearly invisible Higgs boson cascade decays into stable weakly interacting neutral particles.