Analysis of a model with a common source of CP violation
Analysis of a model with a common source of CP violation
复制标题
具有 CP 破坏共同来源的模型分析
DOI：
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发表时间：
2005
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影响因子：
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通讯作者：
Biswajit Adhikary
中科院分区：
文献类型：
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作者：
Biswajit Adhikary
我们工作的模型中所有 CP 破坏现象都有一个共同的来源。 CP 通过复单线态标量的相位在大尺度 V 下自发断裂。额外的 SU(2)L 单重态矢量状下型夸克将这种高尺度 CP 破坏与低能量联系起来。我们在夸克领域定量分析了这个模型。我们获得了 4 × 4 下型夸克质量矩阵的特定 ansatz 夸克扇区中拉格朗日参数的数值，其中弱相产生最少。顶点将在存在额外的类似矢量的下型夸克的情况下修改。从部分衰变宽度的实验下界，我们找到了附加下型夸克质量的下界。由于额外的矢量状下型夸克的存在，树级风味变化的中性电流出现在该模型中。对于 q = d, s，我们使用 SM 盒、Z 中介树级别和 Z 中介单循环图一起给出系统中质量分裂的值范围。我们从系统 q = d, s 的标准盒、Z 介导企鹅图和希格斯介导企鹅图中找到了该模型中 Γq12 的解析表达式。由此我们对衰减宽度差异进行数值评估。我们还分别找到了衰减 B0d → J/ψKs 和 B0d → π+π− 的 CP 不对称参数 aJ 和 aπ 的数值。我们通过强CP相的上限得到尺度V的下界。
We work in a model where all CP-violating phenomena have a common source. CP is spontaneously broken at a large scale V through the phase of a complex singlet scalar. An additional SU(2)L singlet vector-like down-type quark relates this high scale CP violation to low energy. We quantitatively analyse this model in the quark sector. We obtain the numerical values of the parameters of the Lagrangian in the quark sector for a specific ansatz of the 4 × 4 down-type quark mass matrix where the weak phase is generated minimally. vertex will modify in presence of the extra vector-like down-type quark. From the experimental lower bound of the partial decay width , we find the lower bound of the additional down-type quark mass. Tree level flavour changing neutral current appears in this model due to the presence of the extra vector-like down-type quark. We give the range of values of the mass splitting in system using SM box, Z-mediating tree level and Z-mediating one loop diagrams together for both q = d, s. We find the analytical expression for Γq12 in this model from standard box, Z- and Higgs-mediated penguin diagrams for system, q = d, s. From this we numerically evaluate the decay width difference . We also find the numerical values of the CP asymmetry parameters aJ and aπ for the decays B0d → J/ψKs and B0d → π+π−, respectively. We get the lower bound of the scale V through the upper bound of the strong CP phase.