论文标题
顺磁EDM的标准模型预测
Standard Model prediction for paramagnetic EDMs
论文作者
论文摘要
众所周知，与Cabibbo-Kobayashi-Maskawa Quark混合矩阵相关的标准型号$ CP $违规行为可为EDM可观察物提供小答案。此外，对中子和磁磁原子EDM的预测遭受了相当大的不确定性。我们指出，与电子自旋相关的$ cp $略有观测值（顺磁EDMS）由baryon部门中的electroweak企鹅图和$ΔI= 1/2 $弱的过渡组合所主导，并且在窃听扰动理论中可计算出来。半蛋白质运算符的预测尺寸$ c_s $是$ 7 \ times 10^{ - 16} $，对应于等效的电子EDM $ $ d_e^{\ rm eq} = 1.0 \ times 10^{ - 35} e \，{\ rm cm cm cm} $。虽然离当前的观察限制仍然很远，但该结果比以前认为的三个数量级要大。
Standard Model $CP$ violation associated with the phase of the Cabibbo-Kobayashi-Maskawa quark mixing matrix is known to give small answers for the EDM observables. Moreover, predictions for the EDMs of neutrons and diamagnetic atoms suffer from considerable uncertainties. We point out that the $CP$-violating observables associated with the electron spin (paramagnetic EDMs) are dominated by the combination of the electroweak penguin diagrams and $ΔI =1/2$ weak transitions in the baryon sector, and are calculable within chiral perturbation theory. The predicted size of the semileptonic operator $C_S$ is $7\times 10^{-16}$ which corresponds to the equivalent electron EDM $d_e^{\rm eq} = 1.0 \times 10^{-35}e\,{\rm cm}$. While still far from the current observational limits, this result is three orders of magnitude larger than previously believed.
