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arXiv 1002.0342hep-phhep-th
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CP破坏使非厄米质量矩阵的左右对称扩张显得不自然

CP Violation Makes Left-Right Symmetric Extensions With Non-Hermitian Mass Matrices Appear Unnatural

Steffen Gielen

摘要:

继最近类似的分析CP破坏的电弱部门的标准模型,我们估计的自然性的大小CP破坏(测量的Jarlskog不变量J)接近观察值的扩展标准模型与左右对称,如帕蒂-萨拉姆模型,夸克质量矩阵一般不是厄米特。我们在复矩阵空间上构造了一个简单而自然的测度,它既有几何上的动机,又使用了观测到的夸克质量等级。我们发现,与标准模型中J的观测值看起来相当典型的情况不同,人们现在期望观测到|J| < 10^{-7},这显然与观测值J $\approx$ 3 x 10^{-5}相冲突。计算中的关键区别在于质量矩阵的非厄米性,它修改了测量。我们的结论是,需要额外的假设修改的措施,以重现观察值,并在这个意义上的标准模型是首选某些类的左右对称扩展:它不需要额外的假设来解释的幅度CP破坏。

英文摘要:

Following a similar recent analysis for CP violation in the electroweak sector of the standard model, we estimate the naturalness of a magnitude of CP violation (measured by the Jarlskog invariant J) close to the observed value in extensions of the standard model with left-right symmetry, such as the Pati-Salam model, where quark mass matrices are not Hermitian in general. We construct a simple and natural measure on the space of complex matrices which is both geometrically motivated and uses the observed quark mass hierarchy. We find that, unlike in the case of the standard model where the observed value for J seemed rather typical, one would now expect to observe |J|< 10^{-7}, clearly in conflict with the observed value J $\approx$ 3 x 10^{-5}. The crucial difference in the calculation lies in the non-Hermiticity of mass matrices that modifies the measure. We conclude that one would need additional assumptions modifying the measure to reproduce the observed value, and that in this sense the standard model is preferred to certain classes of left-right symmetric extensions: It does not need additional assumptions to explain the magnitude of CP violation.

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