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- W2940596543 abstract "We report measurements of branching fractions for the decays B→Pℓνℓ, where P are the pseudoscalar charmless mesons π−, π0, η and η′, based on 348 fb−1 of data collected with the BABAR detector, using B0 and B+ mesons found in the recoil of a second B meson decaying as B→D(*)ℓνℓ. Assuming isospin symmetry, we combine pionic branching fractions to obtain B(B0→π−ℓ+νℓ)=(1.54±0.17(stat)±0.09(syst))×10−4; we find 3.2σ evidence of the decay B+→ηℓ+νℓ and measure its branching fraction to be (0.64±0.20(stat)±0.03(syst))×10−4, and determine B(B+→η′ℓ+νℓ)<0.47×10−4 to 90% confidence level. Using partial branching fractions for the pionic decays in ranges of the momentum transfer and a variety of form factor calculation, we obtain values of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vub| in ranging from 3.6×10−3 to 4.1×10−3.Received 15 May 2008DOI:https://doi.org/10.1103/PhysRevLett.101.081801©2008 American Physical Society" @default.
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