论文标题
在低$ q^2 $的旋转总和规则和极化的结果
Results on spin sum rules and polarizabilities at low $Q^2$
论文作者
论文摘要
我们报告了有关旋转总规则的最近发布的实验结果，尤其是在广义的自旋极化$γ_0（q^2）$（对于质子和中子）和$δ__\ mathrm {lt}（q^2）$（对于中子）。该数据是通过实验E97110（中子）在A Hall A的Jefferson Lab和实验E03006和E05111（Proton and Deuteron）中获取的。实验涵盖了非常低的$ q^2 $域，降低到$ q^2 \ simeq 0.02 $ gev $^2 $。这很擅长手性有效田间理论（$χ$ eft）预测应有效的领域。一些测量的可观察结果与最先进的$χ$ eft预测一致，但其他可观察的预测包括$δ_\ mathrm {lt}^n（q^2）$，预计$χ$ eft预测将是可靠的。这表明，即使在实验覆盖的非常低的$ q^2 $下，$χ$ eft尚未始终如一地描述核子自旋可观察物。
We report on recently published experimental results on spin sum rules, and particularly on the generalized spin polarizabilities $γ_0(Q^2)$ (for both the proton and neutron) and $δ_\mathrm{LT}(Q^2)$ (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 $Q^2$ domain, down to $Q^2 \simeq 0.02$ GeV$^2$. This is well into the domain where Chiral Effective Field Theory ($χ$EFT) predictions should be valid. Some measured observables agree with the state-of-the-art $χ$EFT predictions but others are in tension, including $δ_\mathrm{LT}^n(Q^2)$ which $χ$EFT prediction was expected to be robust. This suggests that $χ$EFT does not yet consistently describe nucleon spin observables, even at the very low $Q^2$ covered by the experiments.
