Poloarization Measurement of Photoproduced Hyperon Pairs at GlueX.

We have studied the spin structure of photoproduced hyperon pairs for the first time. At Jefferson Lab, we have accumulated data of the reactions γp→ Λ anti-Λ p (with Λ→π^-p, anti-Λ→π⁺anti-p ) from threshold up to a beam photon energy of 11.4 GeV. Phenomenological Monte Carlo models have been developed to identify various mechanisms producing anti-Λ Λ and anti-Λ p systems according to the momentum and angular distributions. Preliminary hyperon polarization measurements in several coordinate systems, as well as a spin correlation study of the hyperon pairs from GlueX Phase-I period will be presented. These results, along with the differential cross section measurements presented, promise to give a better insight into the role strangeness plays in the dynamics of the photoproduced baryonic systems.