Onset of Quark-Hadron Duality in Pion Electroproduction

A large data set of charged- pion(π^±) electroproduction from both hydrogen and deuterium targets has been obtained spanning the low-energy residual-mass region. These data conclusively show the onset of the quark- hadronduality phenomenon, as predicted for high-energy hadronelectroproduction. We construct several ratios from these data to exhibit the relation of this phenomenon to the high- energy factorizationansatz of electron- quarkscattering and subsequent quark→ pionproduction mechanisms.