| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 10722222 | Physics Letters B | 2009 | 9 Pages |
Abstract
We study the single transverse spin asymmetry for the inclusive pion production in the nucleon-nucleon collision, pâpâÏX, based on the twist-3 mechanism in the collinear factorization. We derive the soft-fermion-pole (SFP) contribution to 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 AN 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Yuji Koike, Tetsuya Tomita,