期刊
PHYSICS LETTERS B
卷 638, 期 2-3, 页码 178-186出版社
ELSEVIER
DOI: 10.1016/j.physletb.2006.05.044
关键词
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We study the single transverse-spin asymmetry in semi-inclusive hadron production in deep inelastic scattering. We derive the leading contribution to the asymmetry at moderate transverse momentum P-h perpendicular to of the produced hadron in terms of twist-three quark-gluon correlation functions, and compare with the result obtained from the approach based on factorization at fixed transverse momentum which involves asymmetric transverse-momentum and spin-dependent quark distributions. We verify that the two approaches yield identical results in this regime. Comparing with our earlier calculations for the single-spin asymmetry in the Drell-Yan process, we confirm the sign difference between the time-reversal-odd transverse-momentum-dependent quark distributions in the two processes. (c) 2006 Elsevier B.V. All rights reserved.
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