Spin Sum Rules at Low $Q^2$ - Nuclear ExperimentReport as inadecuate

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Abstract: Recent precision spin-structure data from Jefferson Lab have significantlyadvanced our knowledge of nucleon structure at low $Q^2$. Results on theneutron spin sum rules and polarizabilities in the low to intermediate $Q^2$region are presented. The Burkhardt-Cuttingham Sum Rule was verified withinexperimental uncertainties. When comparing with theoretical calculations,results on spin polarizability show surprising disagreements with ChiralPerturbation Theory predictions. Preliminary results on first moments at verylow $Q^2$ are also presented.

Author: Jian-ping Chen

Source: https://arxiv.org/

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