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Some discrepancies between theory and experiment in the B -> pi K decayssuggest the possibility of a new physics contribution with the structure of anelectroweak penguin amplitude. If such a scenario is realised in nature, thebranching ratios of the decays B_s -> phi pi and B_s -> phi rho can be enhancedby about one order of magnitude. We review and update the current status of theB -> pi K puzzle and its implications for the decays B_s -> phi pi and B_s ->phi rho.

Status of the B -> pi K puzzle and its relation to B_s -> phi pi and B_s -> phi rho decays