CKM unitarity normalization tests, present and future
CKM unitarity normalization tests, present and future
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CKM 单一性归一化检验，现在和未来
DOI：
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发表时间：
2013
期刊：
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通讯作者：
I. Towner
中科院分区：
文献类型：
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作者：
J. Hardy;I. Towner
Cabibbo-Kobayashi-Maskawa (CKM) 夸克混合矩阵是电弱标准模型的核心支柱。矩阵的元素必须通过实验确定，但模型要求矩阵本身是酉的。任何与幺正性的偏差都将标志着标准模型之外的“新物理”的存在，因此 CKM 幺正性的检验引起了相当大的关注。目前最精确的测试是顶行的归一化，根据超允许的 0+ →0- 核 β 衰变以及 kaon 半轻子和轻子衰变的测量，其精度现已达到 0.06%。这项工作概述了标准化测试的状态并推测了未来可能的改进。
The Cabibbo‐Kobayashi‐Maskawa (CKM) quark‐mixing matrix is a central pillar of the Electroweak Standard Model. The elements of the matrix must be determined from experiment, but the Model requires the matrix itself to be unitary. Any deviation from unitarity would signal the presence of “new physics” beyond the Standard Model, so tests of CKM unitarity have attracted considerable attention. Currently the most precise test is of the normalization of the top row, which has now reached a precision of 0.06% based on measurements of superallowed 0+ →0‐ nuclear β decay and of kaon semileptonic and leptonic decays. This work overviews the status of the normalization tests and speculates on likely future improvements.