Accessing quark orbital motion in semi-inclusive DIS experiments at Jefferson Lab Hall A and Hall C.

A program of semi-inclusive deep-inelastic scattering experiments at Jefferson Lab Hall A and Hall C has been developed to access quark orbital motion in a nucleon. This program includes: 1. Single-spin asymmetry $A^n_{UT}$ measurements in Jefferson Lab Hall A through $\vec{n}(e,e^\prime \pi^\pm)$ reactions on a transversely polarized $^3$He target to access quark transversity distributions in the neutron. 2. Single-spin asymmetry $A^p_{UT}$ measurements through $\vec{p}(e,e^\prime \pi^\pm)$ reactions on a transversely polarized proton target in Jefferson Lab Hall C to access quark transversity distributions in the proton. 3. Double-spin asymmetry $A^p_{LT}$ measurements with a longitudinally polarized electron beam scattered off a transversely polarized proton target in $\vec{p}({\vec e},e^\prime \pi^\pm)$ reactions in Jefferson Lab Hall C to access the leading-twist quark transverse-momentum dependent distribution functions $g^q_{1T}(x)$.