Charming penguins in B -> pi pi from QCD light-cone sum rules
Abstract
We use QCD light-cone sum rules to examine the B -> pi pi hadronic matrix element of the current-current operator with c quarks in the penguin topology (``charming penguin'') as a potential source of the substantial O(1/m_b) effects. Our results indicate that charming penguins do not generate sizable nonperturbative effects at finite m_b. The same is valid for the penguin contractions of the current-current operators with light quarks. The dominant penguin topology effects are predicted to be O(\alpha_s). Still, the nonperturbative effects at finite m_b can accumulate to a visible effect that is illustrated by calculating the CP-asymmetry in the B^0_d -> pi^+ pi^- decay.
Keywords
Cite
@article{arxiv.hep-ph/0306305,
title = {Charming penguins in B -> pi pi from QCD light-cone sum rules},
author = {B. Melic},
journal= {arXiv preprint arXiv:hep-ph/0306305},
year = {2011}
}
Comments
Invited talk at at the Workshop on the CKM Unitarity Triangle, IPPP Durham, April 2003 (eConf C0304052). 4 pages LaTeX, 5 eps figures