Observation of the naive-T-odd sivers effect in deep-inelastic scattering.

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Azimuthal single-spin asymmetries of leptoproduced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd, transverse-momentum-dependent parton distribution function is deduced from nonvanishing Sivers effects for pi;{+}, pi;{0}, and K;{+/-}, as well as in the difference of the pi;{+} and pi;{-} cross sections.

Airapetian A, Akopov N, Akopov Z, Aschenauer EC, Augustyniak W, Avetissian A, Avetisyan E, Bacchetta A, Ball B, Bianchi N, Blok HP, Böttcher H, Bonomo C, Borissov A, Bryzgalov V and Burns J,

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Physical review letters 103(15):152002, 2009 Oct 9 - Who cited this? | PubMed ID: 19905623 | Fulltext

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