Subleading-twist effects in single-spin asymmetries in semi-inclusive deep-inelastic scattering on a longitudinally polarized hydrogen target
The HERMES Collaboration, A. Airapetian, :
Abstract
Single-spin asymmetries in the semi-inclusive production of charged pions in deep-inelastic scattering from transversely and longitudinally polarized proton targets are combined to evaluate the subleading-twist contribution to the longitudinal case. This contribution is significantly positive for (π+) mesons and dominates the asymmetries on a longitudinally polarized target previously measured by . The subleading-twist contribution for (π-) mesons is found to be small.
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