Single-spin azimuthal asymmetries in electroproduction of neutral pions in semi-inclusive deep-inelastic scattering

A. Airapetian et al. (HERMES Collaboration)
Phys. Rev. D 64, 097101 – Published 5 October 2001
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Abstract

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 analyzing power in the sinφ 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 π0 asymmetry is of the same size as the π+ 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.

  • Received 4 April 2001

DOI:https://doi.org/10.1103/PhysRevD.64.097101

©2001 American Physical Society

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Vol. 64, Iss. 9 — 1 November 2001

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