New Physics in CP Asymmetries and Rare B Decays

We review and update the effects of physics beyond the standard model on CP asymmetries in $B$ decays. These asymmetries can be significantly altered if there are important new-physics contributions to \bqbqbar\ mixing. This same new physics will therefore also contribute to rare, flavor-changing $B$ decays. Through a study of such decays, we show that it is possible to partially distinguish the different models of new physics.