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General Constraints on Spin Observables, Applications to Antiproton Proton to Antilambda Lambda and to Polarized Quark Distributions | | Xavier ARTRU
; Jean-Marc RICHARD
; | | Date: |
29 Dec 2003 | | Journal: | Phys.Part.Nucl. 35 (2004) S126-S132 | | Subject: | hep-ph | | Affiliation: | Lyon) and Jean-Marc RICHARD (Grenoble | | Abstract: | 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. | | Source: | arXiv, hep-ph/0401234 | | Services: | Forum | Review | PDF | Favorites | |
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