Probing multigluon correlations through single spin asymmetries in pp collisions

We study the single spin asymmetries for the $D$-meson production, Drell-Yan lepton-pair production and the direct-photon production in the $pp$ collision induced by the twist-3 three-gluon correlation functions in the transversely polarized nucleon. We present a corresponding polarized cross section formula in the leading-order with respect to the QCD coupling and a model calculation for the asymmetries, illustrating the sensitivity to the form of the correlation functions.Comment: Proceedings of the talk presented at the 8th Circum-Pan-Pacific Symposium on High Energy Spin Physics: PacSPIN2011, Cairns, Australia, June 20-24, 2011. 6 pages, 3 figure

Probing the three-gluon correlation functions by the single spin asymmetry in p^\uparrow p\to DX

We study the single transverse-spin asymmetry for the inclusive open-charm production in the pp-collision, p^\uparrow p\to DX, induced by the three-gluon correlation functions in the polarized nucleon. We derive the corresponding twist-3 cross section formula in the leading order with respect to the QCD coupling constant. As in the case of the semi-inclusive deep inelastic scattering, ep^\uparrow\to eDX, our result differs from the previous result in the literature. We also derive a "master formula" which expresses the twist-3 cross section in terms of the gg\to c\bar{c} hard scattering cross section. We present a model calculation of the asymmetry at the RHIC energy, demonstrating the sensitivity of the asymmetry on the form of the three-gluon correlation functions.Comment: 25 pages, 7 figures. Final version to appear in PRD. Some changes in the section of numerical calculation include