"We consider the scattering of charged W bosons [...] the sum of all diagrams still diverges as s/Mw^2. Heavy leptons cannot help us, so the only solution is to introduce a scalar particle which cancels these residual divergences [...] Here, h is just the Higgs particle. If we had not previously introduced it to generate the heavy boson masses, we would have been forced to invent it now to guarantee renormalizability [...] Higgs particles have so far eluded experimental searches [...] one might speculate that they do not exist as elementary fields, adn the higgs "particle" we have introduced actually corresponds to a more complex object [...]"

F. Halzen and A.D. Martin, "Quarks and Leptons", J.Wiley&sons 1984, p.344.