Reexamination of The Standard Model Nucleon Electric Dipole Moment
Reexamination of The Standard Model Nucleon Electric Dipole Moment
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标准模型核子电偶极矩的重新检验
DOI：
10.1103/physrevc.91.025502
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发表时间：
2014
影响因子：
3.1
通讯作者：
C. Seng
中科院分区：
文献类型：
--
作者：
C. Seng
标准模型中的Cabibbo-Kobayashi-Maskawa矩阵是目前唯一经实验证实的CP破坏源。二十多年前，人们通过强子回路和极图研究了由CP相诱导的核子的内禀电偶极矩，但现有的计算受到各种理论问题的影响，如手征功率计数的崩溃和低能常数确定的不确定性。本文基于重重子手征微扰理论，在保留功率计数的前提下，对单圈和极图对核子电偶极矩的贡献进行了最新的重新分析，并根据最近文献的结果重新确定了低能常数.结合高阶贡献的估计，我们预计标准模型核子电偶极矩的长距离贡献约为$（1\times10^{-32}-6\times10 ^{-32}）e\，\mathrm{cm}$。
The Cabibbo-Kobayashi-Maskawa matrix in the Standard Model is currently the only experimentally-confirmed source of CP-violation. The intrinsic electric dipole moment of the nucleon induced by this CP-phase via hadronic loop and pole diagrams has been studied more than two decades ago, but the existing calculation is subject to various theoretical issues such as the breakdown of chiral power counting and uncertainties in the determination of low energy constants. We carry out an up-to-date re-analysis on both one-loop and pole diagram contributions to the nucleon electric dipole moment based on Heavy Baryon Chiral Perturbation Theory in a way that preserves power counting, and redo the determination of the low energy constants following the results of more recent articles. Combined with an estimation of higher-order contributions, we expect the long-distance contribution to the Standard Model nucleon electric dipole moment to be approximately $(1\times10^{-32}-6\times10^{-32})e\,\mathrm{cm}$.