Photoproduction of Neutral Pions off Protons
  Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector in the reaction $\gamma p\to p\pi^0$ for photon energies between 0.85 and 2.50 GeV. The $\pi^0$ mesons are observed in their dominant neutral decay mode: $\pi^0\to\gamma\gamma$. For the first time, the differential cross sections cover the very forward region, $\theta_{\rm c.m.}<60^\circ$. A partial-wave analysis of these data within the Bonn-Gatchina framework observes the high-mass resonances $G_{17}$(2190), $D_{13}$(2080), and $D_{15}$(2070). 
The CBELSA/TAPS Collaboration: V. Crede, N. Sparks, A. Wilson, A.V.   Anisovich, J.C.S. Bacelar, R. Bantes, O. Bartholomy, D...
nucl-ex hep-ex hep-ph