We present a measurement of the branching fraction for the rare decays B→ρeν and extract a value for the magnitude of Vub, 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 parametrize the hadronic current in semileptonic decays. Using a sample of 55×106 BB̅ meson pairs recorded with the BABAR detector at the PEP-II e+e- storage ring, we obtain B(B0→ρ-e+ν)=(3.29±0.42±0.47±0.55)×10-4 and |Vub|=(3.64±0.22±0.25-0.56+0.39)×10-3, where the uncertainties are statistical, systematic, and theoretical, respectively.
Measurement of the Cabibbo-Kobayashi-Maskawa Matrix Element |Vub| with B→ρeν Decays
LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;TOSI, SILVANO;
2003-01-01
Abstract
We present a measurement of the branching fraction for the rare decays B→ρeν and extract a value for the magnitude of Vub, 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 parametrize the hadronic current in semileptonic decays. Using a sample of 55×106 BB̅ meson pairs recorded with the BABAR detector at the PEP-II e+e- storage ring, we obtain B(B0→ρ-e+ν)=(3.29±0.42±0.47±0.55)×10-4 and |Vub|=(3.64±0.22±0.25-0.56+0.39)×10-3, where the uncertainties are statistical, systematic, and theoretical, respectively.File in questo prodotto:
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