Experimental Study of Duality in SIDIS at JLab

Measurements of semi-inclusive deep-inelastic scattering have been made using an unpolarized electron beam of energy 5.5 GeV scattering from both proton and deuteron targets. Measurements were made with $\pi^+$ or $\pi^-$ detected in coincidence with the electrons. The dependence of hadron kinematic variable was studied for $0.3 < z < 1$ and $0 < p_t < 0.5$ GeV for average electron kinematic vvariables $x=0.32$ and $W=2.5$ GeV. The $x$-dependence was also studied in the range $0.2 < x < 0.5$ for average $z= 0.55$. Although the electron-pion missing mass $W^\prime<2$ GeV for these data, they are reasonably consistent (for $z < 0.7$) with expectations from higher energy data assuming factorization of quark densities functions and current fragmentation functions.