Abstract
Three new results are discussed: (a) A non-vanishing amplitude for the `wrong sign{'} kaon decay B \to J/\Psi \bar{K} or its CP conjugate is shown to be a necessary condition for obtaining different CP asymmetries in B \to J/\Psi K_{S,L}. A significant effect would require a scale of new physics far below the weak scale, all but ruling out this possibility. (b) The leading isospin breaking contributions to the B \to K^* \gamma decay amplitudes can be calculated in QCD factorization, providing a sensitive probe of the penguin sector of the effective weak Hamiltonian. New physics models which reverse the predicted 10-20% Standard Model amplitude hierarchy could be ruled out with more precise data. (c) A slowly falling g^* g \eta^\prime form factor can be ruled out using the \eta^\prime spectrum obtained by ARGUS at the \Upsilon (1S). The decay b \to s g \eta^\prime is therefore highly suppressed and the origin of the anomalously large B \to \eta^\prime X_s rate remains unknown, perhaps requiring the intervention of New Physics.