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Bonn 2001 – scientific programme

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T: Teilchenphysik

T 104: Feldtheorie 1

T 104.4: Talk

Monday, March 26, 2001, 17:00–17:15, HS III

Is the CKM matrix unitary? — •Hartmut Abele1, Marga Astruc Hoffmann1, Stefan Baessler1, Dirk Dubbers2, Michael Kreuz1, Ulrich Mayer1, Daniela Mund1, Valery Nesvizhevsky2, Uta Peschke1, Jurgen Reich1, Christian Vogel1, and Oliver Zimmer21Physikalisches Institut, Univ. Heidelberg, Philosophenweg 12, 69120 Heidelberg — 2Institut Laue-Langevin, B.P. 156, 38042 Grenoble

An important aspect of the universality of the electroweak interaction is the unitarity condition of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. We have measured the beta-asymmetry in the decay of free polarized neutrons. Together with the world average of the neutron lifetime τ and the Fermi decay constant GF, we derive the first element Vud of the CKM matrix. In using this value from a baryon decay, the first element of the CKM matrix has been derived from particle physics alone.The unitarity check differs by more than three sigma standard deviation from unitarity. A measurement of the neutrino asymmetry in the decay of free neutrons is envisaged for this spring.

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