Is the Higgs a visible particle?

@article{Bollini1997IsTH,
  title={Is the Higgs a visible particle?},
  author={Carlos Guido Bollini and Maria Cossu Rocca},
  journal={Il Nuovo Cimento A (1971-1996)},
  year={1997},
  volume={110},
  pages={363-367}
}
SummaryWe suggest that the Higgs might be unobservable as a free particle, due to its origin at a symmetry-breaking mechanism. The standard model is kept intact, only the definition of the vacuum for the Higgs is changed. With the new (natural) definition, the Higgs propagator is half-advanced and half-retarded. This Green’s function is compatible with the absence of free particles. 
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