Note on the Extraction of |V_{ub}| using Radiative B Decays

Details Note on the Extraction of |V_{ub}| using Radiative B Decays Note on the Extraction of |V_{ub}| using Radiative B Decays

2001-04-26

arxiv.org/abs/hep-ph/0104280v3

Phys.Lett. B513 (2001) 88-92

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures; revised version containing a response to hep-ph/0105066, main conclusions unchanged

Scientific paper

10.1016/S0370-2693(01)00668-2

The element |V_{ub}| of the quark mixing matrix can be extracted with small theoretical uncertainties by combining weighted integrals over the endpoint regions of the lepton spectrum in B -> X_u l nu decays and the photon spectrum in B -> X_s gamma decays. The perturbative corrections to this determination are computed at next-to-leading order including operator mixing, which has an important impact. The effect of Sudakov resummation is shown to be numerically insignificant.

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