Extraction of |Vub| with Reduced Dependence on Shape Functions

Details Extraction of |Vub| with Reduced Dependence on Shape Functions Extraction of |Vub| with Reduced Dependence on Shape Functions

2007-02-07

arxiv.org/abs/hep-ph/0702072v2

Phys.Rev.D76:114003,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 5 figures, 4 tables. The version submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.76.114003

Using BaBar measurements of the inclusive electron spectrum in B->X_u e nu decays and the inclusive photon spectrum in B->X_s gamma decays, we extract the magnitude of the CKM matrix element Vub. The extraction is based on theoretical calculations designed to reduce the theoretical uncertainties by exploiting the assumption that the leading shape functions are the same for all b->q transitions (q is a light quark). The results agree well with the previous analysis, have indeed smaller theoretical errors, but are presently limited by the knowledge of the photon spectrum and the experimental errors on the lepton spectrum.

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