Speaker
Kazuhiro Tanaka
Description
We discuss the gluonic correlations in the transversely polarized nucleon, which are relevant to single and double spin asymmetries in various hard processes. We explain that the single transverse-spin asymmetry (SSA) to be observed in the D-meson production with large
transverse-momentum in semi-inclusive deep inelastic scattering, $e p^\uparrow \rightarrow e D X$, is induced by the three-gluon correlation effects. We present the numerical calculations of the corresponding SSA at the kinematics relevant to a future Electron
Ion Collider, based on the QCD factorization formula at twist three.
We also clarify the independent degrees of freedom associated with three-gluon correlation effects, deriving the new exact twist-three relations between the multi-gluon correlators based on the operator product expansion and the QCD equations of motion. As a byproduct of our analysis, we mention the transverse-spin sum rule as the partonic decomposition of the transverse nucleon spin.
The detail of this work is reported in our recent papers,
Phys. Rev. D85, 114026 (2012) and JHEP1302, 003 (2013).
