Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-04-02
Phys.Rev.D64:097101,2001
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 1 figure, replaced to correct eprint author field, 2nd replacement to correct figure; upper limit of model prediction
Scientific paper
10.1103/PhysRevD.64.097101
A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analysing power in the sin(phi) moment of the cross section is 0.019 +/- 0.007(stat.) +/- 0.003(syst.). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi^0 asymmetry is of the same size as the pi^+ asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark.
Airapetian A.
HERMES Collaboration
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