Quark mixing, CKM unitarity

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Abstract.

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 $\sigma$ to 2.7 $\sigma$ deviation from unitarity, which conflicts with the Standard Model.

Received: 25 October 2003, Published online: 29 January 2004
F. Glück: Present address: Johannes Gutenberg University Mainz, Inst. Physics, WA EXAKT, 55099 Mainz, Germany
A. Serebrov: Also: Paul Scherrer Institut, 5232 Villigen PSI, Switzerland