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Standard Model Prediction for Paramagnetic Electric Dipole Moments
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-11-28 , DOI: 10.1103/physrevlett.129.231801 Yohei Ema 1 , Ting Gao 2 , Maxim Pospelov 1, 2
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-11-28 , DOI: 10.1103/physrevlett.129.231801 Yohei Ema 1 , Ting Gao 2 , Maxim Pospelov 1, 2
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Standard model violation associated with the phase of the Cabibbo-Kobayashi-Maskawa quark mixing matrix is known to give small answers for the electric dipole moment (EDM) observables. Moreover, predictions for the EDMs of neutrons and diamagnetic atoms suffer from considerable uncertainties. We point out that the -violating observables associated with the electron spin (paramagnetic EDMs) are dominated by the combination of the electroweak penguin diagrams and weak transitions in the baryon sector, and are calculable within chiral perturbation theory. The predicted size of the semileptonic operator is , which corresponds to the equivalent electron EDM . While still far from the current observational limits, this result is 3 orders of magnitude larger than previously believed.
中文翻译：
顺磁电偶极矩的标准模型预测
标准型号已知与 Cabibbo-Kobayashi-Maskawa 夸克混合矩阵的相位相关的违反给出了电偶极矩 (EDM) 可观测值的小答案。此外，对中子和反磁性原子的 EDM 的预测存在相当大的不确定性。我们指出-违反与电子自旋（顺磁EDM）相关的可观察量由电弱企鹅图和重子区的弱跃迁，并且可以在手性微扰理论中计算。半轻子算子的预测大小是, 对应于等效电子 EDM. 虽然距离目前的观测极限还很远，但这个结果比之前认为的大了 3 个数量级。
更新日期：2022-11-29
中文翻译：
顺磁电偶极矩的标准模型预测
标准型号已知与 Cabibbo-Kobayashi-Maskawa 夸克混合矩阵的相位相关的违反给出了电偶极矩 (EDM) 可观测值的小答案。此外，对中子和反磁性原子的 EDM 的预测存在相当大的不确定性。我们指出-违反与电子自旋（顺磁EDM）相关的可观察量由电弱企鹅图和重子区的弱跃迁，并且可以在手性微扰理论中计算。半轻子算子的预测大小是, 对应于等效电子 EDM. 虽然距离目前的观测极限还很远，但这个结果比之前认为的大了 3 个数量级。
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