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Searching for new physics with B → K π decays

Article history: Received 6 November 2008 Received in revised form 18 February 2009 Accepted 10 March 2009 Available online 14 March 2009 Editor: B. Grinstein We propose a method to quantify the Standard Model uncertainty in B → Kπ decays using the experimental data, assuming that power counting provides a reasonable estimate of the subleading terms in the 1/mb expansion. Using this method, we show that present B → Kπ data are compatible with the Standard Model. We analyze the pattern of subleading terms required to reproduce the B → Kπ data and argue that anomalously large subleading terms are not needed. Finally, we find that S K Sπ is fairly insensitive to hadronic uncertainties and obtain the Standard Model estimate S K Sπ = 0.74 ± 0.04. © 2009 Elsevier B.V. Open access under CC BY license.