Profiles of the unitarity triangle and CP-violating phases in the standard model and supersymmetric theories
Profiles of the unitarity triangle and CP-violating phases in the standard model and supersymmetric theories
复制标题
标准模型和超对称理论中的幺正三角形和 CP 破坏相的轮廓
DOI：
10.1007/s100529900098
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
D. London
中科院分区：
文献类型：
--
作者：
A. Ali;D. London
抽象的。我们报道了在标准模型和最小超对称标准模型(MSSM)的几个变体中，CKM么正三角形的轮廓以及在B衰变中产生的CP不对称性的比较研究，该模型的特征是夸克味混合矩阵中的单相。在这些理论中，超对称对质量差[D_d]、[M_S]和[CP-破坏量]的贡献在极佳的近似值下是相等的，这使得根据这些量的现有知识实现对元素的约束提供了一种特别简单的方法。结合次前级修正和对超对称参数施加当前的直接和间接约束，我们发现标准模型和MSSM模型中的β2β的预测范围非常相似。然而，在B工厂和强子机器上的精确测量也许能够根据另外两个违反CP的阶段$\α$和$\r$来区分这些理论。这对于$\Delta M_d$、$\Delta M_S$和$\vert\epsilon\vert$中的超对称贡献的一些代表值进行了说明。
Abstract. We report on a comparative study of the profile of the CKM unitarity triangle, and the resulting CP asymmetries in B decays, in the standard model and in several variants of the minimal supersymmetric standard model (MSSM), characterized by a single phase in the quark flavour mixing matrix. The supersymmetric contributions to the mass differences $\Delta M_d$, $\Delta M_s$ and to the CP-violating quantity $\vert\epsilon\vert$ are, to an excellent approximation, equal to each other in these theories, allowing for a particularly simple way of implementing the resulting constraints on the elements of $V_{CKM}$ from the present knowledge of these quantities. Incorporating the next-to-leading-order corrections and applying the current direct and indirect constraints on the supersymmetric parameters, we find that the predicted ranges of $\sin 2 \beta$ in the standard model and in MSSM models are very similar. However, precise measurements at B-factories and hadron machines may be able to distinguish these theories in terms of the other two CP-violating phases $\alpha$ and $\gamma$. This is illustrated for some representative values of the supersymmetric contributions in $\Delta M_d$, $\Delta M_s$ and $\vert \epsilon\vert$.