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Spin observables and spin structure functions: Inequalities and dynamics by Xavier Artru; Mokhtar Elchikh; Jean-Marc Richard; Jacques Soffer; Oleg V. Teryaev is a Physics and Astronomy article available to read on EtoBox.

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Model-independent identities and inequalities which relate the various spin observables of collisions in nuclear and particle physics are reviewed in a unified formalism. Their physical interpretation and their implications for dynamical models are also discussed. These constraints between observables can be obtained in several ways: from the explicit expression of the observables in terms of a set of helicity or transversity amplitudes, a nontrivial algebraic exercise which can be preceded by numerical simulation with randomly chosen amplitudes, from anticommutation relations, or from the requirement that any polarisation vector is less than unity. The most powerful tool is the positivity of the density matrices describing the spins in the initial or final state of the reaction or its crossed channels. The inequalities resulting from positivity need to be projected to single out correlations between two or three observables. The quantum aspects of the information carried by spins, in particular entanglement, are considered when deriving and discussing the constraints. Several examples are given, with a comparison with experimental data in some cases. For the exclusive reactions, t

Who reads Spin observables and spin structure functions: Inequalities and dynamics?

Author

Xavier Artru; Mokhtar Elchikh; Jean-Marc Richard; Jacques Soffer; Oleg V. Teryaev

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0370-1573)

Published

2009

Language

EN

Field

Physics and Astronomy (Physical Sciences)