ΔG and Δq-bar measurements at PHENIX

摘要

RHIC provides a unique opportunity to address the components of the proton spin. In comparison to deep inelastic scattering experiments, the gluon is the main player in proton‐proton collisions. PHENIX has measured double spin asymmetries of various processes. Those contain the information of the gluon spin component (ΔG). In addition high energy collisions open the unique channel to access flavor dependent information of quark polarization through the real W boson production. Because of the feature of weak interaction, the parity violating process defines the helicity of quarks in the interaction. The single spin asymmetry is the observable. It is especially interesting to probe anti‐quark components (Δq-bar). In this article, we report the recent progress of ΔG and Δq-bar measurements at PHENIX.