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Observation of the naive-T-odd Sivers effect in deep-inelastic scattering
A Airapetian1, N Akopov, Z Akopov
1Physikalisches Institut, Universität Giessen, 35392 Giessen, Germany.
Abstract:
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.
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