Positivity Constraints on Spin Observables in Exclusive Pseudoscalar Meson Photoproduction
نویسنده
چکیده
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 Marseille Cedex 09 France (Dated: January 23, 2007)
منابع مشابه
N ov 1 99 5 Amplitude ambiguities in pseudoscalar meson photoproduction
We consider the problem of determining amplitudes from observables for the case of pseudoscalar meson photoproduction. We find a number of surprisingly simple constraints which give necessary conditions for a complete set of measurements. These results contradict one of the selection rules derived previously. PACS Numbers: 13.60.Le, 13.88.+e
متن کاملCompleteness Rules for Spin Observables in Pseudoscalar Meson Photoproduction
The number and type of measurements needed to ascertain the amplitudes for pseudoscalar meson photoproduction are analyzed in this paper. It is found that 8 carefully selected measurements can determine the four transversity amplitudes without discrete ambiguities. That number of measurements is one less than previously believed. We approach this problem in two distinct ways: (1) solving for th...
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...
متن کاملPolarization in Hyperon Photo- and Electro- Production
Multiple polarization observables must be measured to access the amplitude structure of pseudoscalar meson photoproduction off the proton. The hyperon-producing reactions are especially attractive to study, since the weak decays allow straightforward measurement of the induced and recoil polarization observables. In this paper we emphasize γ + p → K +Λ, discussing recent measurements of Cx, Cz,...
متن کاملAmbiguities in the partial-wave analysis of pseudoscalar-meson photoproduction.
Ambiguities in the partial-wave analysis of pseudoscalar-meson photoproduction Abstract Ambiguities in pseudoscalar-meson photoproduction, arising from incomplete experimental data, have analogs in pion-nucleon scattering. Amplitude ambiguities have important implications for the problems of amplitude extraction and resonance identification in partial-wave analysis. The effect of these ambiguit...
متن کامل