Photoproduction of Θ+

We study photoproduction of Θ+ for several cases of JP of Θ+. It is shown that in an effective lagrangian approach, the contact term of γKNΘ+ plays a dominant role for charge-exchange processes, especially for the case of J = 3/2. Consequently, we have found a large asymmetry between the production rates from the proton and neutron targets; σ(γn → K-Θ+) >> σ(γp → K-bar0Θ+). The resulting total cross sections are of order few nb or less for the case of the proton target, which is compatible with the upper bound estimated by the recent results of the CLAS experiment. We also point out that the strong forward peak in angular distributions would make the observation of Θ+ very sensitive to experimental setups