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B -> pi pi hadronic amplitudes from QCD light-cone sum rules

We analyse B->pi pi decays, obtaining the relevant hadronic amplitudes from QCD light-cone sum rules (LCSR). In this approach the B-> pi pi hadronic matrix elements with annihilation topology are finite and turn out to be small with respect to the factorizable amplitude. The pattern of B -> pi pi amplitudes obtained from LCSR, including emission, penguin and annihilation effects, does not reveal significant deviations from naive factorization and agrees with the predictions of QCD factorization if the latter approach is taken with moderate values of the annihilation parameters. We find a substantial discrepancy between our predictions and the current data for B -> pi+ pi− and B -> p0 p0 indicating a missing piece of deltaI = 1/2 transition amplitude

B decays

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