QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi (CROSBI ID 101081)
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Khodjamirian, A. ; Mannel, T. ; Melić, Blaženka
engleski
QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi
Employing the QCD light-cone sum rule approach we calculate the B -> pi pi 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 -> pi pi 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 m_b are absent. The same is valid for the penguin contractions of the current-current operators with light quarks.
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