Estimate of SU(3) flavour symmetry breaking in B_s -> K^+ K^- vs. B_d -> pi^+π^- decay

M. Beneke

I estimate the SU(3) flavour symmetry breaking in the ratio of penguin-to-tree ratios of the decays B_s\to K^+ K^- and B_d\toπ^+π^-, given an assumption on the flavour symmetry bre…