Relativistic Resonances, Relativistic Gamow Vectors and Representations of the Poincare' Semigroup

Details Relativistic Resonances, Relativistic Gamow Vectors and Representations of the Poincare' Semigroup Relativistic Resonances, Relativistic Gamow Vectors and Representations of the Poincare' Semigroup

1999-12-22

arxiv.org/abs/hep-th/9912228v1

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, 1 figure. To be published in Proceedings of the International Symposium `Quantum Theory and Symmetries' (Goslar, 18-

Scientific paper

The foundations of time asymmetric quantum theory are reviewed and are applied to the construction of relativistic Gamow vectors. Relativistic Gamow vectors are obtained from the resonance pole of the S-matrix and furnish an irreducible representation of the Poincare' semigroup. They have all the properties needed to represent relativistic quasistable particles and can be used to fix the definition of mass and width of relativistic resonances like the Z-boson. Most remarkably, they have only a semigroup time evolution into the forward light cone---expressing time asymmetry on the microphysical level.

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