Polarization in hyperon photo- and electro-production⋆
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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, and P for this reaction. An empirical constraint on the helicity amplitudes is obtained. A simplified model involving spin-flip and spin-non-flip amplitudes is presented. Finally, a semi-classical model of how the polarization may arise is presented.
PACS.25.20.Lj Photoproduction reactions 13.40.-f Electromagnetic processes and properties 13.60.Le Meson production 13.60.-r Photon and charged-lepton interactions with hadrons
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