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Published March 24, 2011 | Published
Journal Article Open

Measurement of the B^0 → π^-ℓ^+ ν and B^+ → η^((′))ℓ^+ν branching fractions, the B^0 → π^- ℓ^+ ν and B^+ → ηℓ^+ ν form-factor shapes, and determination of |V_(ub)|


We report the results of a study of the exclusive charmless semileptonic decays, B^+ → η^((′))ℓ^+ν and B^0 → π^-ℓ^+ν, undertaken with approximately 464 × 10^6 BB̅ pairs collected at the Υ(4S) resonance with the BABAR detector. The analysis uses events in which the signal B decays are reconstructed with a loose neutrino reconstruction technique. We obtain partial branching fractions for B^+ → ηℓ^+ν and B^0 → π^-ℓ^+ν decays in three and 12 bins of q^2, respectively, from which we extract the f_+(q^2) form-factor shapes and the total branching fractions B(B^+ → ηℓ^+ν)=(0.36 ± 0.05_(stat) ± 0.04_(syst))× 10^(-4) and B(B^0 → π^-ℓ^+ν)=(1.42 ± 0.05_(stat) ± 0.07_(syst)) × 10^(-4). We also measure B(B^+ → η^′ℓ^+ν)=(0.24 ± 0.08_(stat) ± 0.03_(syst))× 10^(-4). We obtain values for the magnitude of the CKM matrix element |V_(ub)| using three different QCD calculations.

Additional Information

© 2011 American Physical Society. Received 7 October 2010; published 24 March 2011. We would like to thank A. Khodjamirian, A. Kronfeld, and R. Van de Water for useful discussions concerning their form-factor calculations and for providing the values of Δζ used in this work. We would also like to thank J. Dingfelder and B. Viaud for their numerous contributions to this analysis. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovación (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union), the A. P. Sloan Foundation (U.S.) and the Binational Science Foundation (U.S.-Israel).

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