Derezinski J., Gerard C. Asymptotic completeness in quantum field theory.Massive Pauli-Fierz Hamiltonians (593K, Postscript) ABSTRACT. Spectral and scattering theory of massive Pauli-Fierz Hamiltonians is studied. Asymptotic completeness of these Hamiltonians is shown. The proof consists of three parts. The first is a construction of asymptotic fields and a proof of their Fock property. The second part is a geometric analysis of observables. Its main result is what we call geometric asymptotic completeness. Finally, the last part is a proof of asymptotic completeness itself.