Possibility of determining the parity of the pentaquark Θ+ from photoproduction near threshold

We discuss the possibility of determining the parity of the W baryon from the photoproduction process gamma N -> K Theta(+) near threshold. We utilize the conservation laws of parity and angular momentum for the analysis of angular distributions and spin observables near threshold. Since the discussion is in essence a partial wave analysis of the production mechanism, the result should be less dependent on the model parameters. Our analysis shows that the angular distribution and photon polarization asymmetry for the process of a neutron target are sensitive to the parity of the Theta(+), but not for the case of a proton target. In the case of proton target, the polarization asymmetries of target and recoiled Theta(+) are preferred for parity determination.