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Published October 1, 2013 | Published + Submitted
Journal Article Open

Measurement of the B^+ → ωℓ^+ν branching fraction with semileptonically tagged B mesons


We report a measurement of the branching fraction of the exclusive charmless semileptonic decay B^+→ωℓ^+ν, where ℓ is either an electron or a muon. We use samples of B^+ mesons tagged by a reconstructed charmed semileptonic decay of the other B meson in the event. The measurement is based on a data set of 426.1  fb^(-1) of e^+e^- collisions at a center-of-mass energy of 10.58 GeV recorded with the BABAR detector at the PEP-II asymmetric-energy e^+e^- storage rings. We measure a branching fraction of B(B^+→ωℓ^+ν)=(1.35±0.21±0.11)×10^(-4), where the uncertainties are statistical and systematic, respectively. We also present measurements of the partial branching fractions in three bins of q^2, the invariant-mass squared of the lepton-neutrino system, and we compare them to theoretical predictions of the form factors.

Additional Information

© 2013 American Physical Society. Received 13 August 2013; published 15 October 2013. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (U.S.), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MINECO (Spain), STFC (U.K.). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation (U.S.).

Attached Files

Published - PhysRevD.88.072006.pdf

Submitted - 1308.2589v1.pdf


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August 19, 2023
October 25, 2023