Measurement of the inclusive semileptonic branching fraction of B mesons and |Vcb|

Abstract

We present a measurement of the electron spectrum from inclusive semileptonic {\it B} decay, using 5.1 fb${}^{-1}$ of ${\rm Y}(4S)$ data collected with the Belle detector. A high-momentum lepton tag was used to separate the semileptonic {\it B} decay electrons from secondary decay electrons. We obtained the branching fraction, $\mathcal{B}(B\to X{e}^{+}\nu )=(10.90\pm 0.12\pm 0.49)$, with minimal model dependence. From this measurement, we derive a value for the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|=0.0408\pm 0.0010(\exp )\pm 0.0025(\mathrm{th})$.

16 pages, 3 figures, 3 tables

References in corpus (1)

• Measurements of inclusive semileptonic branching fractions of b hadrons in Z decays

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