QCD Spin Physics: Partonic Spin Structure of the Nucleon
D. de Florian, R. Sassot, M. Stratmann, W. Vogelsang
TL;DR
Recent experimental results from RHIC and COMPASS have advanced understanding of the nucleon's spin structure, revealing non-zero gluon polarization and improved constraints on sea quark helicity distributions.
Contribution
The paper reviews recent experimental developments that provide new insights into the partonic spin structure of the nucleon, especially gluon and sea quark contributions.
Findings
Evidence for non-zero gluon polarization from jet production at RHIC
Enhanced constraints on strange and light sea quark helicity distributions from SIDIS data
Observation of single-longitudinal spin asymmetries in W-boson production at RHIC
Abstract
We discuss some recent developments concerning the nucleon's helicity parton distribution functions: New preliminary data from jet production at RHIC suggest for the first time a non-vanishing polarization of gluons in the nucleon. SIDIS measurements at COMPASS provide better constraints on the strange and light sea quark helicity distributions. Single-longitudinal spin asymmetries in W-boson production have been observed at RHIC and will ultimately give new insights into the light quark and anti-quark helicity structure of the nucleon.
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