Review of Experimental Results on Neutral B Meson Oscillations

The current status of the experimental knowledge of neutral B meson oscillations is reviewed. The B d oscillation frequency is precisely measured by SLD, CDF, and the LEP experiments. An overview of the analyses and their combination is presented. Preliminary measurements and perspectives at the running B factories are also briefly discussed. The much faster B s oscillations have not yet been resolved, despite the progress recently achieved by SLD and ALEPH. The world combination is presented, together with the expected and observed lower limit on the B s oscillation frequency. The “amplitude method”, used to combine the analyses in order to set the limit, is discussed also as a tool to establish the significance of a possible signal.