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QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi (CROSBI ID 101081)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Khodjamirian, A. ; Mannel, T. ; Melić, Blaženka QCD light-cone sum rule estimate of charming penguin contributions in B -> pi pi // Physics letters. B, 571 (2003), 3-4; 75-84. doi: 10.1016/j.physletb.2003.08.012

Podaci o odgovornosti

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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Podaci o izdanju

571 (3-4)

2003.

75-84

objavljeno

0370-2693

10.1016/j.physletb.2003.08.012

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Fizika

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