Quark mixing,CKM unitarity |
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| Authors: | Abele H. Barberio E. Dubbers D. Glück F. Hardy J. C. Marciano W. J. Serebrov A. Severijns N. |
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| Affiliation: | (1) Physikalisches Institut der Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany;(2) Physics Department, Southern Methodist University, Dallas, TX, USA;(3) Research Institute for Nuclear and Particle Physics, POB 49, 1525 Budapest, Hungary;(4) Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA;(5) Brookhaven National Laboratory Upton, 11973 New York, USA;(6) Petersburg Nuclear Physics Institute, 188350 Gatchina, Leningrad District, Russia;(7) Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium |
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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  to 2.7  deviation from unitarity, which conflicts with the Standard Model.Received: 25 October 2003, Published online: 29 January 2004F. Glück: Present address: Johannes Gutenberg University Mainz, Inst. Physics, WA EXAKT, 55099 Mainz, GermanyA. Serebrov: Also: Paul Scherrer Institut, 5232 Villigen PSI, Switzerland |
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