The hidden Higgs model at the NLC
  We investigate the influence of massless scalar singlets on Higgs signals at the NLC. An exclusion bound is presented which restricts large regions of the parameter space but on the other hand implies that for strong interactions between the Higgs boson and the singlet fields of the hidden sector, detection of such a non standard Higgs signal can become impossible. 
T. Binoth and J.J. van der Bij (University of Freiburg, FRG)