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We study the possibility of observing an `invisible' Higgs boson in centralexclusive diffractive production at the LHC. We evaluate the cross sectionusing, as a simple example, the Standard Model with a heavy fourth generation,where the invisible decay mode $H \to \nu_4 \bar{\nu}_4$ dominates, with theheavy neutrino mass $M(\nu_4) \simeq 50$ GeV. We discuss the possiblerequirements on trigger conditions and the background processes.Comment: 8 pages, 1 figur

Can an invisible Higgs boson be seen via diffraction at the LHC?