FIRST MEASUREMENT OF BEAM-RECOIL OBSERVABLES C(X) AND C(Z) IN HYPERON PHOTOPRODUCTION
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DOIAbstract
Spin transfer from circularly polarized real photons to recoiling hyperons has been measured for the reactions gamma+p -> K++Lambda and gamma+p -> K++Sigma(0). The data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS) detector at the Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85 < cos theta(+c.m.)(K)<+0.95. For the Lambda, the polarization transfer coefficient along the photon momentum axis, C-z, was found to be near unity for a wide range of energy and kaon production angles. The associated transverse polarization coefficient C-x is smaller than C-z by a roughly constant difference of unity. Most significantly, the total Lambda polarization vector, including the induced polarization P...
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