Estimate of the charming penguin contributions to B -> pi pi

Abstract

We consider the problem of factorization in B decays and illustrate the calculation of nonfactorizable contributions employing the QCD light-cone sum rule method. We present a more detailed calculation of the ``charming penguin'' contributions as a potential source of the substantial nonfactorizable O(1/m_b) effects in the B -> pi pi decay. Although the predicted corrections are not sizable, by calculating the CP asymmetry we illustrate how such corrections can accumulate to a visible effect. In conclusion, nonfactorizable contributions in nonleptonic B decays into charmonium are briefly discussed.

Comments: 3 pages, 3 figures included, svjour.cls. Based on the invited talks at Flavor Physics and CP Violation (FPCP 2003), Paris, France, 3-6 Jun 2003 and at International Europhysics Conference on High Energy Physics EPS in Aachen, Germany, 17 - 23.07.2003, to appear in proceedings