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In 1982 Hawking suggested that quantum fluctuations of space-time metric willinduce a non-unitary evolution from pure initial states to mixed final statesin particle interactions at any energy. This hypothesis can be tested usingexisting CERN data on pi(-) p -> pi(-)pi(+) n on polarized target at 17.2GeV/c. The purity of the final state is controlled by the purity of recoilnucleon polarization. We develop a spin formalism to calculate expressions forrecoil nucleon polarization for two specific pure initial states. Imposingconditions of purity on the recoil nuclon polarization we obtain conditions onthe amplitudes which are violated by model independent amplitude analysis ofCERN data at large t. We conclude that pure states can evolve into mixed statesin pi(-) p -> pi(-)pi(+) n. In quantum theory such non-unitary evolution occursin open quantum systems interacting with an environment. We present evidence tovalidate the view of the pion creation process as an open quantum systeminteracting with a quantum environment. The observed process istime-irreversible and violates CPT symmetry.

Evidence for evolution from pure states to mixed states in pion creation  process pi(-) p -> pi(-)pi(+) n on polarized target and its physical  interpretation