  Based on the hadronic model with the gauge prescription suggested by Ohta and
Haberzettl, we investigate the possibility of determining the parity state of
the $\Theta^+$ baryon using photon induced processes, $\gamma n\to K^-
\Theta^+$ and $\gamma p\to \bar{K}^0 \Theta^+$. The total and differential
cross sections are simulated in two versions of pseudovector(PV) and
pseudoscalar(PS) coupling schemes and the results are reported both on the
positive and negative parity states of the $\Theta^+$ baryon. It is found that
in both coupling schemes the total cross sections from the neutron target are
in general larger than those from the proton target, regardless of the
$\Theta^+$ parities. The cross sections of the $\Theta^+$ production however
depend largely on the value of the $\Theta^+$ decay width which is not yet well
established. Moreover, there is a wide theoretical uncertainty associated with
the different assumption on the gauge prescription in model calculations. We
discuss these points by comparing theoretical predictions with the existing
experimental data. Our analysis suggests that the observation of the angular
distribution rather than just the total cross section in the photoproduction
process may be a useful tool to distinguish the parity of the $\Theta^+$
baryon.

Nuclear Theory;High Energy Physics - Phenomenology