BB mixing: A review of recent progress

Abstract In view of the recent measurements of relatively large B0d B 0d mixing and the subsequent theoretical activity, we review the subject of B B mixing. We sumarize the constraints on the standard model that are imposed, and also discuss B B mixing in some “minimal” extensions of the standard model, such as supersymmetry and two Higgs doublet models. We discuss some of the predictions and outcomes of the mixing results, for example, severe constraints on quark mass matrix schemes such as those of Fritzsch and Stech. We conclude by considering how new measurements can contribute further information.

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