QCD Light-Cone Sum Rule Estimate of Charming Penguin Contributions in B -> pi pi
High Energy Physics - Phenomenology
2015-06-25 v2
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0304179,
title = {QCD Light-Cone Sum Rule Estimate of Charming Penguin Contributions in B -> pi pi},
author = {A. Khodjamirian and Th. Mannel and B. Melic},
journal= {arXiv preprint arXiv:hep-ph/0304179},
year = {2015}
}
Comments
12 pages, 5 figures included ; minor corrections