Solving the unitarity question: New NA48 results on semileptonic Kaon and Hyperon decays

by Rainer Wanke (University of Mainz)

Tuesday 10 Aug 2004, 16:30 → 17:30 Europe/Zurich

500/1-001 - Main Auditorium (CERN)

The unitarity of the CKM matrix is a key ingredient of the Standard Model. Any significant deviation from unitarity would be a manifestiation of new physics. However, the first row of the CKM matrix, involving the elements Vus and Vud, fulfills unitarity at present only at a 10% confidence level, which has triggered great interest in new measurements of these matrix elements. In the recent years the NA48 experiment and its successor NA48/1 have recorded large samples of K meson and neutral Hyperon decays. In this talk, new precision measurements from NA48 on the branching fractions of neutral Kaon and Hyperon beta decays are presented. Both measurements allow to extract the CKM matrix element |Vus| with small theoretical uncertainties and therefore lead to a stringent test of CKM unitarity. In addition, further new NA48 results on semileptonic and rare Kaon decays will be presented.

Organiser(s): Rolf Landua / EP Department
More information: Tea & coffee will be served at 16.00 hrs.