Evidence for a single-spin azimuthal asymmetry in semi-inclusive pion electroproduction

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342 Scopus citations


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.

Original languageEnglish
Pages (from-to)4047-4051
Number of pages5
JournalPhysical Review Letters
Issue number18
StatePublished - 2000

ASJC Scopus subject areas

  • General Physics and Astronomy


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