Abstract
New high-energy photoproduction data on the two-pion and four-pion distributions in the region of 1600 MeV show evidence of resonance structure. The photoproduced two-pion final state is described by a resonance of mass \ensuremath{\sim} 1600 MeV and width of \ensuremath{\sim} 300 MeV whereas the four-pion distribution is characterized by a mass of \ensuremath{\sim} 1500 MeV and a width of \ensuremath{\sim} 600 MeV. The implications of these new data for colliding electron-positron beam measurements are presented using a simple theoretical model.
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