Onset of quark-hadron duality in pion electroproduction

Phys Rev Lett. 2007 Jan 12;98(2):022001. doi: 10.1103/PhysRevLett.98.022001. Epub 2007 Jan 10.


A large data set of charged-pion (pi+/-) 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-hadron duality phenomenon, as predicted for high-energy hadron electroproduction. We construct several ratios from these data to exhibit the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark-->pion production mechanisms.