Abstract
This is a tentative theory of quantum measurement performed on particles with unspecified mass. For such a particle, the center of the wave packet undergoes a classical motion which is a precious guide to our approach. The framework is manifestly covariant and a priori nonlocal. It allows for describing an irreversible process which lasts during a nonvanishing lapse of time. The possibility to measure a dynamical variable in an arbitrary slate is discussed. Our picture is most satisfactory if we focus on free particles and constants of the motion. Two-particle systems and measurement of individual observables in a correlated slate are considered.
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Droz-Vincent, P. Quantum mechanical evolution of relativistic particles. Found Phys 25, 67–90 (1995). https://doi.org/10.1007/BF02054657
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DOI: https://doi.org/10.1007/BF02054657