Systematic approach to exclusive B ->V l^+l^-, V gamma decays

Details Systematic approach to exclusive B ->V l^+l^-, V gamma decays Systematic approach to exclusive B ->V l^+l^-, V gamma decays

2001-06-06

arxiv.org/abs/hep-ph/0106067v2

Nucl.Phys.B612:25-58,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

34 pages, LaTeX; (v2): reference added, typo in Eq. (93) corrected, Eq. (47) + conventions in Table 1 corrected

Scientific paper

10.1016/S0550-3213(01)00366-2

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.

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