منابع مشابه
GENERAL CONSTRAINTS ON SPIN OBSERVABLES , APPLICATIONS TO p̄ + p → Λ + Λ AND TO POLARIZED QUARK DISTRIBUTIONS
We review the density matrix formalism and the positivity conditions for general multiple spin asymmetries, taking as an example the case ¯ p + p → Λ + Λ 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 poin...
متن کاملConstraints on spin observables in p̄p →
We discuss model-independent inequalities for the spin observables in the reaction p̄p → ΛΛ, which have been measured at CERN with a polarised proton target.
متن کاملPositivity constraints on initial spin observables in inclusive reactions.
For any inclusive reaction of the type A1(spin 1/2)+A2(spin 1/2)-->B+X, we derive new positivity constraints on spin observables and study their implications for theoretical models in view, in particular, of accounting for future data from the polarized pp collider at Brookhaven RHIC. We find that the single transverse spin asymmetry A(N), in the central region for several processes, for exampl...
متن کاملPositivity Constraints on Spin Observables in Exclusive Pseudoscalar Meson Photoproduction
Xavier Artru,1, ∗ Jean-Marc Richard,2, † and Jacques Soffer3, ‡ Institut de Physique Nucléaire de Lyon, CNRS-IN2P3–Université Lyon-I 4, rue Enrico Fermi, 69622 Villeurbanne cedex, France Laboratoire de Physique Subatomique et Cosmologie Grenoble Universités–CNRS-IN2P3-Ingénierie 53, avenue des Martyrs, F–38026 Grenoble Cedex, France Centre de Physique Théorique CNRS, Luminy Case 907, F-13288 Ma...
متن کاملA ug 1 99 9 Constraints on vector meson photoproduction spin observables
Extraction of spin observables from vector meson photoproduction on a nucleon target is described. Starting from density matrix elements in the vector meson’s rest frame, we transform to spin observables in the photon-nucleon c.m. frame. Several constraints on the transformed density matrix and on the spin observables follow from requiring that the angular distribution and the density matrix be...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2000
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.61.035205