Studying the w-mass in-medium in g+A reactions

Simulations based on a coupled-channel transport model have been performed to analyze the feasibility to study the in-medium $\omega$ mass ex ploiting the process $\gamma+A\rightarrow\pi^0\gamma+X$ for $C$, $Ca$ and $Nb$ nuclei. The distortions due to final-state interactions of the $\pi^0$ and background contributions from the reaction $\gamma+A\rightarrow\pi^0\pi^0+X$ are found to be small in the mass range of interest ($0.6<M_{\pi^0\gamma}<0.8$~GeV). Furthermore, the effect of the detector resolution on the $\pi^0\gamma$-mass determination is discussed.