SEARCHING FOR AN INVISIBLY DECAYING HIGGS-BOSON IN E-, E-GAMMA AND GAMMA-GAMMA COLLISIONS(E)

Higgs bosons can have a substantial ''invisible'' branching ratio in m any extensions of the Standard Model, such as models where the Higgs b osons decay predominantly into light or massless weakly interacting Go ldstone bosons. In this work, we examine the production mechanisms and backgrounds for invisibly decaying Higgs bosons at the Next Linear ee- Collider operating in the modes e+e-, egamma, and gammagamma. We de monstrate that such machine is much more efficient to survey for invis ibly decaying Higgs bosons than the Large Hadron Collider at CERN.