Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-02-07
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.
Golubev V. B.
Luth Vera G.
Skovpen Yu. I.
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