2022/02/21 by A. Deur, Deur, Alexandre
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2202.10511
openalex publication_date 2022/02/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report on recently published experimental results on spin sum rules, and particularly on the generalized spin polarizabilities γ0(Q2) (for both the proton and neutron) and δLT(Q2) (for the neutron). The data were taken at Jefferson Lab in Hall A by experiment E97110 (neutron) and in Hall B by experiments E03006 and E05111 (proton and deuteron, respectively). The experiments covered the very low Q2 domain, down to Q2 ≃ 0.02 GeV2. This is well into the domain where Chiral Effective Field Theory (χEFT) predictions should be valid. Some measured observables agree with the state-of-the-art χEFT predictions but others are in tension, including δLTn(Q2) which χEFT prediction was expected to be robust. This suggests that χEFT does not yet consistently describe nucleon spin observables, even at the very low Q2 covered by the experiments.