Systematic approach to exclusive B ->V l^+l^-, V gamma decays
Abstract
We show -- by explicit computation of first-order corrections -- that the QCD factorization approach previously applied to hadronic two-body decays and to form factor ratios also allows us to compute non-factorizable corrections to exclusive, radiative B meson decays in the heavy quark mass limit. This removes a major part of the theoretical uncertainty in the region of small invariant mass of the photon. We discuss in particular the decays B\to K^* \gamma and B\to K^* l^+l^- and complete the calculation of corrections to the forward-backward asymmetry zero. The new correction shifts the asymmetry zero by 30%, but the result confirms our previous conclusion that the asymmetry zero provides a clean phenomenological determination of the Wilson coefficient C_9.
Keywords
Cite
@article{arxiv.hep-ph/0106067,
title = {Systematic approach to exclusive B ->V l^+l^-, V gamma decays},
author = {M. Beneke and Th. Feldmann and D. Seidel},
journal= {arXiv preprint arXiv:hep-ph/0106067},
year = {2010}
}
Comments
34 pages, LaTeX; (v2): reference added, typo in Eq. (93) corrected, Eq. (47) + conventions in Table 1 corrected