2019/03/13 by Deur, A.
#FOS: Physical sciences #Nuclear Experiment (nucl-ex)
paper · doi:10.48550/arxiv.1903.05661
We summarize the experimental program of Jefferson Lab that studies the nucleon spin structure at low Q2. This program completes the precise experimental mapping of the nucleon spin structure functions g1(ν, Q2) and g2(ν, Q2) and their moments started at SLAC, CERN and DESY at high Q2, and continued at Jefferson Lab at intermediate Q2. The results presented cover the domain where Chiral Effective Field Theory (χEFT) should describe the strong interaction. They provide a comprehensive set of benchmark measurements for χEFT. The preliminary conclusion is that nucleon spin structure data are still challenging for χEFT in spite of the notable improvements in these calculations.