Impact of the triple-gluon correlation functions on the single spin   asymmetries in pp collisions
  We calculate the single-spin-dependent cross section formula for the D-meson production and the direct-photon production in the pp collision induced by the twist-3 triple-gluon correlation functions in the transversely polarized nucleon. We also present a model calculation for the asymmetries in comparison with the preliminary data given by RHIC, showing the impact of the correlation functions on the asymmetries. 
Yuji Koike (Niigata U.) and Shinsuke Yoshida (Niigata U., Grad. Sch.   Sci. Tech.)
hep-ph