Journal
PHYSICS LETTERS B
Volume 622, Issue 1-2, Pages 14-22Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2005.06.067
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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 pi(+) mesons and dominates the asymmetries on a longitudinally polarized target previously measured by HERMES. The subleading-twist contribution for pi(-) mesons is found to be small. (c) 2005 Elsevier B.V. All rights reserved.
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