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We investigate photoproduction of the scalar mesona off the nucleon, usingthe effective Lagrangians and the Regge approach. We first study $f_0(980)$photoproduction, replacing the Feynman propagator with the Regge ones for the$\rho$-meson exchange in the $t$-channel. The model parameters are fixed byreproducing the experimental data on the differential cross section. We thenapply the same method to $f_0(500)$ or $\sigma$ photoproduction with the sameparameters for the Regge propagator. Since the threshold energy of the$f_0(500)$ production is rather low, $N^*$ resonances, which can decay into thenucleon and two pions in the isoscalar and scalar state, can come into play inthe $s$-channel. To examine the effects of the $N^*$ resonances, we set up twomodels to look into the respective contribution of the $N^*$ resonances. Wefind that in particular $N^*(1440)$ and $N^*(1680)$ play important roles in$f_0(500)$ photoproduction. We discuss the physical implications of the presentresults.

Photoproduction of the scalar mesons $f_0(500)$ and $f_0(980)$ off the nucleon