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We show that the standard model (SM)-like Higgs boson may decay intoneutrinos with a sizable decay branching ratio in one well-known two Higgsdoublet model, so-called neutrinophilic Higgs model. This could happen if themass of the lighter extra neutral Higgs boson is smaller than one half of theSM-like Higgs boson mass. The definite prediction of this scenario is that therate of the SM-like Higgs boson decay into diphoton normalized by the SM valueis about 0.9. In the case that a neutrino is Majorana particle, a displacedvertex of right-handed neutrino decay would be additionally observed. Thisexample indicates that a large invisible Higgs boson decay could be irrelevantto dark matter.

Large invisible decay of a Higgs boson to neutrinos