Measurement of and at photon energies up to 2.6 GeV
Physikalisches Institut, Bonn University, Bonn, Germany
2 Helmholtz-Institut für Strahlen- und Kernphysik, Bonn University, Bonn, Germany
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The reactions and were measured in the energy range from threshold up to a photon energy of 2.6 GeV. The data were taken with the SAPHIR detector at the electron stretcher facility, ELSA. Results on cross-sections and hyperon polarizations are presented as a function of the kaon production angle and the photon energy. The total cross-section for production rises steeply with energy close to threshold, whereas the cross-section rises slowly to a maximum at about GeV. Cross-sections together with their angular decompositions into Legendre polynomials suggest contributions from resonance production for both reactions. In general, the induced polarization of has negative values in the kaon forward direction and positive values in the backward direction. The magnitude varies with energy. The polarization of follows a similar angular and energy dependence as that of , but with opposite sign.
© Società Italiana di Fisica and Springer-Verlag, 2004