Measurement of the B -> pi l nu Branching Fraction and Determination of |Vub| with Tagged B Mesons

Details Measurement of the B -> pi l nu Branching Fraction and Determination of |Vub| with Tagged B Mesons Measurement of the B -> pi l nu Branching Fraction and Determination of |Vub| with Tagged B Mesons

2006-07-28

arxiv.org/abs/hep-ex/0607089v2

Phys.Rev.Lett.97:211801,2006

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages (including EPAPS), 4 postscript figures

Scientific paper

10.1103/PhysRevLett.97.211801

We report a measurement of the B -> pi l nu branching fraction based on 211 fb-1 of data collected with the BABAR detector. We use samples of B0 and B+ mesons tagged by a second B meson reconstructed in a semileptonic or hadronic decay, and combine the results assuming isospin symmetry to obtain BF(B0 -> pi- l+ nu) = (1.33 +/- 0.17(stat) +/- 0.11(syst)) x 10^-4. We determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vub| by combining the partial branching fractions measured in ranges of the momentum transfer squared and theoretical calculations of the form factor. Using a recent lattice QCD calculation, we find |Vub| = (4.5 +/- 0.5(stat) +/- 0.3(syst) +0.7/-0.5(FF)) x 10^-3, where the last error is due to the normalization of the form factor.

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