The unitarity problem
The unitarity problem
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单一性问题
DOI:
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发表时间:
2003
期刊:
影响因子:
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通讯作者:
N. Severijns
中科院分区:
文献类型:
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作者:
H. Abele;E. Barberio;D. Dubbers;A. Serebrov;N. Severijns
In the Standard Model of elementary particles, quark-mixing is expressed in terms of a 3 x 3 unitary matrix V , the so called Cabibbo-Kobayashi-Maskawa (CKM) matrix. Significant unitarity checks are so far possible for the first row of this matrix. This article reviews the experimental and theoretical information on these matrix elements. On the experimental side, we find a 2.2 � to 2.7 � deviation from unitarity, which conflicts with the Standard Model.