QCD Light-Cone Sum Rule Estimate of Charming Penguin Contributions in B -> pi pi

Details QCD Light-Cone Sum Rule Estimate of Charming Penguin Contributions in B -> pi pi QCD Light-Cone Sum Rule Estimate of Charming Penguin Contributions in B -> pi pi

2003-04-17

arxiv.org/abs/hep-ph/0304179v2

Phys.Lett. B571 (2003) 75-84; Phys.Lett. B572 (2003) 171-180

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 5 figures included ; minor corrections

Scientific paper

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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