Abstract
Single-spin azimuthal asymmetries in semi-inclusive pion production in longitudinally polarized deep-inelastic scattering have been measured for the first time in the HERMES experiment. A significant target-spin asymmetry amplitude of the order of 2% was observed both for π+ and π0. The π− asymmetry is consistent with zero. The corresponding analyzing power in the sin φ moment has been determined as a function of x and P⊥. These results can be interpreted as an effect of a chiral-odd spin distribution function in combination with the T-odd fragmentation function that is sensitive to the transverse polarization of the fragmenting quark.
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