Determining |V_{ub}| from the sum rule for semileptonic B decay

Details Determining |V_{ub}| from the sum rule for semileptonic B decay Determining |V_{ub}| from the sum rule for semileptonic B decay

1999-11-18

arxiv.org/abs/hep-ph/9911396v2

Phys. Rev. D 62, 014020 (2000)

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 5 Postscript figures, analysis of the weighted spectrum expanded, comments and references added, changes in wording,

Scientific paper

10.1103/PhysRevD.62.014020

A precise determination of |V_{ub}| can be obtained exploiting the sum rule for inclusive charmless semileptonic B-meson decays. The sum rule is derived on the basis of light-cone expansion and b-flavored quantum number conservation. The sum rule does not receive any perturbative QCD correction. In this determination of |V_{ub}|, there is no perturbative QCD uncertainty, while the dominant hadronic uncertainty is avoided. Moreover, this method is not only theoretically quite clean, but experimentally also very efficient in the discrimination between B\to X_u\ell\nu signal and B\to X_c\ell\nu background. The sum rule requires measuring the lepton pair spectrum. We analyze the lepton pair spectrum, including the leading perturbative and nonperturbative QCD corrections.

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