标题： 超对称软相位的约束来自重整化群关系 显示英文标题

标题： Constraints on supersymmetric soft phases from renormalization group relations

摘要： 通过使用从重整化群方程（RGEs）导出的关系，我们发现可以从中子的电偶极矩（dn）对At中的顶夸克混合相施加强大的间接约束。 由于mtop较大，At中的任何GUT尺度相都会通过RGEs传递到其他弱尺度相，这些相又会对dn做出贡献。 因此，由弱尺度At引起的CP破坏效应受到强烈约束。 我们发现|Im At(mz)|必须小于或与|Im B(mz)|同阶，使得在大多数模型中顶夸克的电偶极矩无法观测到。 对Au、Ad和B对dn的贡献进行定量估计表明，为了满足dn的实验限制，仍需要大量的微调。 虽然A的低能相不像B(mz)的相那样受到强烈约束，但我们注意到，一个通用的A(GUT)的相会通过RGEs在B(mz)的相中产生大的贡献，因此在大多数具有低于1 TeV的标量夸克质量的模型中，它仍然受到强烈约束。 显示英文摘要

摘要： By using relations derived from renormalization group equations (RGEs), we find that strong indirect constraints can be placed on the top squark mixing phase in At from the electric dipole moment of the neutron (dn). Since mtop is large, any GUT-scale phase in At feeds into other weak scale phases through RGEs, which in turn contribute to dn. Thus CP-violating effects due to a weak-scale At are strongly constrained. We find that |Im At(mz)| must be smaller than or of order |Im B(mz)|, making the electric dipole moment of the top quark unobservably small in most models. Quantitative estimates of the contributions to dn from Au, Ad and B show that substantial fine-tuning is still required to satisfy the experimental bound on dn. While the low energy phases of the A's are not as strongly constrained as the phase of B(mz), we note that the phase of a universal A(GUT) induces large contributions in the phase of B(mz) through RGEs, and is thus still strongly constrained in most models with squark masses below a TeV.