Journal
PHYSICS LETTERS B
Volume 675, Issue 2, Pages 181-189Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2009.04.017
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Funding
- Uchida Energy Science Promotion Foundation
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We study the single transverse spin asymmetry for the inclusive pion production in the nucleon-nucleon collision, p(up arrow)p ->pi X, based oil the twist-3 mechanism in the collinear factorization. We derive the soft-fermion-pole (SFP) contribution 10 the twist-3 single-spin-dependent cross section associated with the twist-3 quark-gluon correlation functions in the polarized nucleon. We find that the SFP can give rise to a large effect to the asymmetry A(N) owing to the large partonic hard cross sections with the large color factor, if the SFP function has a similar magnitude as the soft-gluon-pole (SGP) function. in spite of the absence of the derivative term for the SFP function unlike for the SGP function. (C) 2009 Elsevier B.V. All rights reserved.
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