Abstract.
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.
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U.-G. Meißner
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Schumacher, R. Polarization in hyperon photo- and electro-production⋆ . Eur. Phys. J. A 35, 299–305 (2008). https://doi.org/10.1140/epja/i2007-10558-3
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DOI: https://doi.org/10.1140/epja/i2007-10558-3