Khodjamirian, A.; Mannel, Th.; Melić, Blaženka
QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi.
Physics Letters B, 572
Employing the QCD light-cone sum rule approach we calculate the B --> pipi hadronic matrix element of the current-current operator with c quarks in the penguin topology ("charming penguin"). The dominant contribution to the sum rule is due to the c-quark loop at short distances and is of O(alpha(S)) with respect to the factorizable B --> pipi amplitude. The effects of soft gluons are suppressed at least by O (alpha(S) m(b)(-2)). Our result indicates that sizable nonperturbative effects generated by charming penguins at finite mb are absent. The same is valid for the penguin contractions of the current-current operators with light quarks. (C) 2003 Elsevier B.V. All rights reserved.
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