Abstract
We revisit the calculation of nonfactorizable corrections induced by charm-quark loops in exclusive FCNC B-decays. For the sake of clarity, we make use of a field theory with scalar particles: this allows us to focus on the conceptual issues and to avoid technical complications related to particle spins in QCD. We perform a straightforward calculation of the appropriate correlation function and show that it requires the knowledge of the full generic three-particle distribution amplitude with non-aligned arguments, 〈0|s¯(y)Gμν(x)b(0)|B(p)〉. Moreover, the dependence of this quantity on the variable (x−y)2 is essential for a proper account of the (ΛQCDmb/mc2)n terms in the amplitudes of FCNC B-decays.
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