Charming penguin contributions to charmless B decays into two pseudoscalar mesons

We present estimates of the charming penguin contribution to $\stackrel{\ensuremath{\rightarrow}}{B}K\ensuremath{\pi},\ensuremath{\pi}\ensuremath{\pi},K\ensuremath{\eta},K{\ensuremath{\eta}}^{\ensuremath{'}}$ decays due to intermediate charmed meson states. We find that this contribution is indeed significant for $\stackrel{\ensuremath{\rightarrow}}{B}K\ensuremath{\pi}$ decays, and its inclusion, together with the tree and penguin terms, produces large branching ratios in agreement with data, though the analysis is affected by large theoretical uncertainties. On the other hand, for $\stackrel{\ensuremath{\rightarrow}}{B}\ensuremath{\pi}\ensuremath{\pi},K\ensuremath{\eta},K{\ensuremath{\eta}}^{\ensuremath{'}}$ decays, the effect of the charming penguin contribution is more modest. We also compute $\mathrm{CP}$ asymmetries for $\stackrel{\ensuremath{\rightarrow}}{B}K\ensuremath{\pi},\ensuremath{\pi}\ensuremath{\pi}$ decays, and we obtain rather large results.

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