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Published May 1, 2000 | Published
Journal Article Open

Evidence for a Single-Spin Azimuthal Asymmetry in Semi-inclusive Pion Electroproduction


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 φ of the pion relative to the lepton scattering plane was formed for π^+ electroproduction on a longitudinally polarized hydrogen target. The corresponding analyzing power in the sinφ moment of the cross section is 0.022±0.005±0.003. 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.

Additional Information

© 2000 The American Physical Society. Received 28 October 1999; published in the issue dated 1 May 2000. We thank M. Anselmino, J. Collins, A. M. Kotzinian, and P. J. Mulders for many interesting discussions. We gratefully acknowledge the DESY management for its support, the staffs at DESY and the collaborating institutions for their significant effort, and our funding agencies for financial support.

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