Is the Unitarity Triangle Right
Is the Unitarity Triangle Right
复制标题
酉三角形正确吗
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
W. Scott
中科院分区：
文献类型：
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作者：
P. Harrison;D. Roythorne;W. Scott
CKM 矩阵的最新拟合表明 alpha=(90.7+4.5-2.9) 度。 α 与直角的接近提出了一个问题：这仅仅是偶然的还是由于标准模型之外的某些物理现象造成的？在我们最近提出的味道排列对称性框架中，我们考虑了夸克和轻子混合矩阵 V 和 U 之间的相似性，认为每个元素中一个元素的相对较小表明了共同的约束。这些约束将 V_ub 和 U_e3 的小尺寸相互联系起来，并与轻子混合中观察到的近似 mu-tau 对称性以及夸克和轻子扇区中大狄拉克 CP 相的预测联系在一起。在夸克情况下，我们预测 alpha=(89.0pm 0.2) 度，与数据一致，并表明幺正三角形实际上非常接近，但并不完全正确。
The latest fits to the CKM matrix indicate that alpha=(90.7+4.5-2.9) degrees. The proximity of alpha to a right-angle raises the question: is it merely accidental or is it due to some physics beyond the Standard Model? In the framework of our recently-proposed flavour permutation symmetry, we consider the similarities between the quark and lepton mixing matrices, V and U, arguing that the relative smallness of one element in each suggests common constraints. These constraints link the smallness of V_ub and U_e3 with each other, and with the approximate mu-tau symmetry observed in leptonic mixing, together with a prediction of a large Dirac CP phase in both the quark and lepton sectors. In the quark case, we predict alpha=(89.0pm 0.2) degrees, in agreement with data and suggesting that the unitarity triangle is in fact very nearly, but not exactly right.