Probing Quark-Gluon Interactions with Transverse Polarized Scattering.

Transverse polarized inelastic scattering extends the power of the electromagnetic interaction as a probe of nucleon dynamics beyond the leading order regime explored with longitudinally polarized DIS. In transverse polarized scattering, the twist-3 g(2) spin structure function contributes at the same order as the longitudinal, twist-2, g(1), so interactions between quarks and gluons can be studied, opening a window on the mechanisms of confinement. This talk reports the results of Jefferson Lab's Resonances Spin Structure experiment measurement of g(2) and the d(2) twist-3 quark matrix element at a four-momentum transfer of 1.3 GeV2.