Semi-inclusive π 0 target and beam-target asymmetries from 6 GeV electron scattering with CLAS.

We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. We scattered 6-GeV, longitudinally polarized electrons off longitudinally polarized protons in a cryogenic 14NH3 target, and extracted double and single target spin asymmetries for in multidimensional bins in four-momentum transfer ( GeV2), Bjorken-x (), hadron energy fraction (), transverse pion momentum ( GeV), and azimuthal angle between the lepton scattering and hadron production planes. We extracted asymmetries as a function of both x and , which provide access to transverse-momentum distributions of longitudinally polarized quarks. The double spin asymmetries depend weakly on . The moments are zero within uncertainties, which is consistent with the expected suppression of the Collins fragmentation function. The observed moments suggest that quark gluon correlations are significant at large x