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 $\tan β$.
Probing CP Violation with the Deuteron Electric Dipole Moment
本文分析了4维、5维和6维CP破坏算符(包括θ QCD、夸克的电偶极矩和色电偶极矩、四夸克相互作用和Weinberg算符)诱导的氘核电偶极矩。我们证明,EDM协作的建议,以寻找氘EDM,(1-3)\times 10^{-27} e cm的精度目标,将提供一个改进的灵敏度,这些源的一个-两个数量级相对于现有的界限。我们认为详细的水平,CP-奇相位可以探测内的MSSM。
Electric dipole moments from the perspective of a scalar triplet and singlet extension of the MSSM: A study of neutrons, electrons, mercury, and b and c quarks
A Geometric Approach to CP Violation: Applications to the MCPMFV SUSY Model
我们分析了实验上限内的最大CP-和最小味道违规(MCPMFV)版本的MSSM的电偶极矩(EDM)的约束。由于MCPMFV方案中除了CP奇QCD真空相θ_QCD外,还有6个非标准CP破坏相,因此,对测量的三个EDM的CP破坏贡献(铊、中子和汞)之间可能发生抵消,从而留下了其他CP破坏观测值相对较大的可能性。我们发展了一种新的几何方法,该方法以小相位近似为出发点,考虑了已有的EDM约束,并使我们能够找到其他CP破坏观测量的最大值,如氘和μ子的EDM,b -> s γ衰变中的CP破坏不对称性,以及B_s混合相位。我们应用这种几何方法来提供这些观测值的上限在特定的基准超对称的情况下,包括扩展,允许一个非零θ QCD。
Measurement of Permanent Electric Dipole Moments of Charged Hadrons in Storage Rings
基本粒子的永久电偶极矩违反了两个基本对称性:时间反演不变性(T)和宇称(P)。假设CPT定理,这意味着CP违反。在可预见的未来,在EDM中实验观察到的CP违反的标准模型的数量级太小。它也太小了,无法解释我们宇宙中物质和反物质丰度的不对称性。因此,在标准模型的范围之外的CP破坏的其他机制被搜索,并且可能导致可测量的EDM。到目前为止,大多数EDM测量都是用中性粒子进行的。有了新技术,现在可以在储存环上用带电强子进行专门的EDM实验,其中极化粒子暴露在电场中。如果存在EDM,则自旋矢量将经历导致原始自旋方向改变的扭矩,这可以借助于偏振计来确定。虽然测量的原理很简单,但预期效果的微小性使其成为一个具有挑战性的实验,需要在各个实验领域进行新的开发。布鲁克海文国家实验室和尤利希研究中心正在进行测量质子、氘核和轻核EDM的补充工作,最终目标是达到10^{-29} e cm的灵敏度。