Charming penguins in B -> PP decays and the extraction of gamma

It is shown that inclusion of charming penguins of the size suggested by short-distance dynamics may shift down by $10^o-15^o$ the value of $γ$ extracted via the overall fit to the $B \to PP$ branching ratios. A substantial dependence of the fit on their precise values is found, underscoring the need to improve the reliability of data.

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