Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target

HERMES collaboration; A. Airapetian

doi:10.1016/S0370-2693(03)00566-5

paper

Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target

arXiv:hep-ex/0212039 · doi:10.1016/S0370-2693(03)00566-5

Abstract

Single-spin asymmetries have been measured for semi-inclusive electroproduction of $π^{+}$ , $π^{-}$ , $π^{0}$ and $K^{+}$ mesons in deep-inelastic scattering off a longitudinally polarised deuterium target. The asymmetries appear in the distribution of the hadrons in the azimuthal angle $ϕ$ around the virtual photon direction, relative to the lepton scattering plane. The corresponding analysing powers in the $sin ϕ$ moment of the cross section are $0.012 \pm 0.002 (s t a t .) \pm 0.002 (sy s t .)$ for $π^{+}$ , $0.006 \pm 0.003 (s t a t .) \pm 0.002 (sy s t .)$ for $π^{-}$ , $0.021 \pm 0.005 (s t a t .) \pm 0.003 (sy s t .)$ for $π^{0}$ and $0.013 \pm 0.006 (s t a t .) \pm 0.003 (sy s t .)$ for $K^{+}$ . The $sin 2 ϕ$ moments are compatible with zero for all particles.

Revised version shortened 9 pages, 3 tables, 7 figures

Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target

Abstract

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