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The beam-helicity asymmetry was measured, for the first time, inphotoproduction of $\pi^{0}\eta$ pairs on carbon, aluminum, and lead, with theA2 experimental setup at MAMI. The results are compared to an earliermeasurement on a free proton and to the corresponding theoretical calculations.The Mainz model is used to predict the beam-helicity asymmetry for the nucleartargets. The present results indicate that the photoproduction mechanism for$\pi^{0}\eta$ pairs on nuclei is similar to photoproduction on a free nucleon.This process is dominated by the $D_{33}$ partial wave with the$\eta\Delta(1232)$ intermediate state.

Measurement of the beam-helicity asymmetry in photoproduction of $\pi^{0}\eta$ pairs on carbon, aluminum, and lead