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arXiv 0705.3939hep-ph
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夸克环对中子、氘核和汞的无R宇称超对称EDM的贡献

Quark Loop Contributions to Neutron, Deuteron, and Mercury EDMs from Supersymmetry without R parity

Chan-Chi Chiou, Otto C. W. Kong, Rishikesh D. Vaidya

摘要:

本文从无R宇称的超对称性出发,详细分析了中子、氘和汞的电偶极矩,着重讨论了夸克-标量环的贡献。由于与汤川顶部和顶部质量成比例,这种贡献往往很大。解析表达式示出的R-奇偶违反参数的明确作用给出以下质量平方矩阵的标量微扰对角化。占主导地位的贡献来自组合$B_i λ^{\prime}_{ij1}$,我们获得了强大的界限。结果表明,中子和氘EDM接收更强的贡献比汞EDM和任何无效的结果在未来的氘EDM实验或洛斯阿拉莫斯中子EDM实验可能会导致额外的约束RPV参数空间。即使R-宇称破坏耦合是实的,CKM相位也会引起RPV贡献,并且在某些情况下,这种贡献与R-宇称破坏耦合中的相位的贡献一样强。有趣的是,即使slepton质量和/或$μ_0$高达1 TeV,它仍然会导致中子EDM比洛斯阿拉莫斯实验的灵敏度大一个数量级。由于结果对$\tan β$不太敏感,因此即使其他观测量收紧了对$\tan β$的约束,我们的约束也将继续存在。

英文摘要:

We present a detailed analysis of the neutron, deuteron and mercury electric dipole moment from supersymmetry without R parity, focusing on the quark-scalar loop contributions. Being proportional to top Yukawa and top mass, such contributions are often large. Analytical expressions illustrating the explicit role of the R-parity violating parameters are given following perturbative diagonalization of mass-squared matrices for the scalars. Dominant contributions come from the combinations $B_i λ^{\prime}_{ij1}$ for which we obtain robust bounds. It turns out that neutron and deuteron EDMs receive much stronger contributions than mercury EDM and any null result at the future deuteron EDM experiment or Los Alamos neutron EDM experiment can lead to extra-ordinary constraints on RPV parameter space. Even if R-parity violating couplings are real, CKM phase does induce RPV contribution and for some cases such a contribution is as strong as contribution from phases in the R-parity violating couplings.Hence, we have bounds directly on $|B_i λ^{\prime}_{ij1}|$ even if the RPV parameters are all real. Interestingly, even if slepton mass and/or $μ_0$ is as high as 1 TeV, it still leads to neutron EDM that is an order of magnitude larger than the sensitivity at Los Alamos experiment. Since the results are not much sensitive to $\tan β$, our constraints will survive even if other observables tighten the constraints on $\tan β$.

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