低$Q^2$时的自旋和规则
Spin Sum Rules at Low $Q^2$
摘要：
最近，杰斐逊实验室的精确自旋结构数据大大提高了我们对低$Q^2$核子结构的认识。给出了低到中$Q^2$区中子自旋和规则和极化率的结果。在实验不确定度范围内验证了Burkhartt-Cuttingham求和规则。当与理论计算比较时，自旋极化率的结果与手征微扰理论的预测显示出令人惊讶的分歧。初步结果在非常低的$Q^2$的第一时刻。
英文摘要：
Recent precision spin-structure data from Jefferson Lab have significantly advanced our knowledge of nucleon structure at low $Q^2$. Results on the neutron spin sum rules and polarizabilities in the low to intermediate $Q^2$ region are presented. The Burkhardt-Cuttingham Sum Rule was verified within experimental uncertainties. When comparing with theoretical calculations, results on spin polarizability show surprising disagreements with Chiral Perturbation Theory predictions. Preliminary results on first moments at very low $Q^2$ are also presented.
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