Description of Particles in Quantized Field Theory

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Abstract
The problem of establishing the connection between quantized field theory and observations is discussed in a nonrigorous way without recourse to the idea of asymptotic free fields. The method is based on a prescription for the state vector associated with a single physical particle using the interacting field operator. It is shown that the method leads to the usual form for the scattering matrix, obtained via the asymptotic condition. As a second application, the problem of describing an unstable particle is discussed briefly.

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