Abstract
Single-spin asymmetries for semi-inclusive pion production in deep-inelastic scattering have been measured for the first time. A significant target-spin asymmetry of the distribution in the azimuthal angle of the pion relative to the lepton scattering plane was formed for electroproduction on a longitudinally polarized hydrogen target. The corresponding analyzing power in the moment of the cross section is . This result can be interpreted as the effect of terms in the cross section involving chiral-odd spin distribution functions in combination with a chiral-odd fragmentation function that is sensitive to the transverse polarization of the fragmenting quark.
- Received 28 October 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.4047
©2000 American Physical Society