A model for investigating the parity of Θ using ^3He target

We have performed calculations for ^3He(γ,K^+K^-n) reaction using a model including all tree-diagrams with intermediate Θ, Σ^-, and vector mesons (ρ, ω, and φ).All coupling parameters are determined phenomenologically using the observed widths of hadrons and SU(3) symmetry. It has been found that the double polarization observables with polarized photon on polarized n or ^3He depend sensitively on the parity of θ. Detailed results on angular distributions will be presented for identifying favorable kinematics for experimental searches.