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Using a chiral unitary approach for meson-baryon scattering in thestrangeness zero sector, where the $N^*(1535)$ resonance is dynamicallygenerated, we study the reactions $\gamma p \to \pi^0 \eta p$ and $\gamma p \to\pi^0 K^0 \Sigma^+$ at photon energies at which the final states are producedclose to threshold. Among several reaction mechanisms, we find the mostimportant is the excitation of the $\Delta^*(1700)$ state which subsequentlydecays into a pseudoscalar meson and a baryon belonging to the $\Delta(1232)$decuplet. Hence, the reaction provides useful information with which to testcurrent theories of the dynamical generation of the low-lying $3/2^-$ states.The first reaction is shown to lead to sizable cross sections and the$N^*(1535)$ resonance shape is seen clearly in the $\eta p$ invariant massdistribution. The same dynamical model is shown to lead to much smaller crosssections at low energies in the second reaction. Predictions are made for crosssections and invariant mass distributions which can be compared withforthcoming experiments at ELSA.Comment: 22 pages, 22 figure

physical review. c. nuclear physics/physical review. c, nuclear physics

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Chiral dynamics in theγp→π0ηpandγp→π0