Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-14
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 4 eps figures. To appear in the proceedings of 15th International Workshop on Deep-Inelastic Scattering and Related S
Scientific paper
We prove that twist-3 soft-gluon-pole (SGP) cross section for single spin asymmetries is determined by a certain ``primordial'' twist-2 cross section up to kinematic and color factors in the leading order perturbative QCD. This unveils universal structure behind the SGP cross sections in a variety of hard processes, and also the special role of the scale invariance in the corresponding primordial cross section, which leads to remarkable simplification of the SGP cross sections for the production of massless particle, such as those for pion production p^\uparrow p \to \pi X and direct-photon production p^\uparrow p \to \gamma X.
Koike Yuji
Tanaka Kazuhiro
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