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arXiv 0910.2265hep-ph
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最小左右对称模型尺度上的中子电偶极矩约束

Neutron Electric Dipole Moment Constraint on Scale of Minimal Left-Right Symmetric Model

Fanrong Xu, Haipeng An, Xiangdong Ji

摘要:

利用一种有效的理论方法,在最小左右对称模型中计算了显式和自发CP破坏下的中子电偶极矩。我们整合出重粒子,以获得味道中性CP违反有效拉格朗日。我们用单圈重整化群方程计算了从电弱标度到强子标度的Wilson系数。利用最新的强子矩阵元,我们得到了nEDM作为右手W玻色子质量和CP破坏参数的函数。我们使用的电流限制nEDM结合的K介子衰变参数$ε$提供最严格的约束,但对左右对称尺度$ M_{W_R} > (10 \pm 3) $ TeV。

英文摘要:

Using an effective theory approach, we calculate the neutron electric dipole moment (nEDM) in the minimal left-right symmetric model with both explicit and spontaneous CP violations. We integrate out heavy particles to obtain flavor-neutral CP-violating effective Lagrangian. We run the Wilson coefficients from the electroweak scale to the hadronic scale using one-loop renormalization group equations. Using the state-of-the-art hadronic matrix elements, we obtain the nEDM as a function of right-handed W-boson mass and CP-violating parameters. We use the current limit on nEDM combined with the kaon-decay parameter $ε$ to provide the most stringent constraint yet on the left-right symmetric scale $ M_{W_R} > (10 \pm 3) $ TeV.

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