Measurements of B→{π,η,η′}lνl branching fractions and determination of |Vub| with semileptonically tagged B mesons

Journal article

We report measurements of branching fractions for the decays B→P/ν/, where P are the pseudoscalar charmless mesons π-, π0, η and η′, based on 348fb-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(*)/ν/. Assuming isospin symmetry, we combine pionic branching fractions to obtain B(B0→π-/+ν/)=(1.54±0. 17(stat)±0.09(syst))×10-4; we find 3.2σ evidence of the decay B+→η/+ν/ and measure its branching fraction to be (0.64±0.20(stat)±0.03(syst))×10-4, and determine B(B+→η′/+ν/)<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. © 2008 The American Physical Society.

Authors: Aubert, B; Bona, M; Karyotakis, Y; Lees, J; Poireau, V

• Journal: Physical Review Letters
• Volume: 101
• Issue: 8
• Publication date: 2008-08-22
• DOI: 10.1103/PhysRevLett.101.081801
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English