Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-01-29
Phys.Part.Nucl. 35 (2004) S126-S132
Physics
High Energy Physics
High Energy Physics - Phenomenology
Minor typos corrected, including normalization factors in Eqs. (2.1-2.2). 10 pages, latex, Invited talk by X. Artru at the Xth
Scientific paper
We review the density matrix formalism and the positivity conditions for general multiple spin asymmetries, taking as an example the case antiproton + proton -> antiLambda + Lambda, in which one, two or three spins are analyzed. Some aspects related to quantum information and entangled states are discussed. Some positivity domains for pairs and triplets of spin parameters are displayed, together with the experimental points. The case of inclusive reaction is also treated, taking as an example the spin- and transverse momentum- dependent quark distributions.
Artru Xavier
Richard Jean-Marc
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