Measurement of the Cabibbo-Kobayashi-Maskawa matrix element │Vub│ with B → ρeν decays

B Aubert, Theresa Harrison, Kelly Ford, Christopher Hawkes, David Knowles, Sian Morgan, Richard Penny, Alan Watson, Nigel Watson

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28 Citations (Scopus)


We present a measurement of the branching fraction for the rare decays B-->rhoenu and extract a value for the magnitude of V(ub), one of the smallest elements of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix. The results are given for five different calculations of form factors used to para-metrize the hadronic current in semileptonic decays. Using a sample of 55 x 10(6) BB meson pairs recorded with the BABAR detector at the PEP-II e(+)e(-) storage ring, we obtain B(B0-->rho(-)e(+)nu)=(3.29+/-0.42+/-0.47+/-0.55) x 10(-4) and |V(ub)|=(3.64+/-0.22+/-0.25(+0.39)(-0.56)) x 10(-3), where the uncertainties are statistical, systematic, and theoretical, respectively.
Original languageEnglish
Pages (from-to)181801
Number of pages1
JournalPhysical Review Letters
Issue number18
Early online date1 May 2003
Publication statusPublished - 1 May 2003


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