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Several particles are not observed directly, but only through their decayproducts. We consider the possibility that they might be fakeons, i.e. fakeparticles, which mediate interactions but are not asymptotic states. A crucialrole to determine the true nature of a particle is played by the imaginaryparts of the one-loop radiative corrections, which are affected in nontrivialways by the presence of fakeons in the loop. The knowledge we have today issufficient to prove that most non directly observed particles are true physicalparticles. However, in the case of the Higgs boson the possibility that itmight be a fakeon remains open. The issue can be resolved by means of precisionmeasurements in existing and future accelerators.

On the nature of the Higgs boson