Measurement of the B[superscript +] → ωℓ[superscript +]ν branching fraction with semileptonically tagged B mesons
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Lees-2013-Measurement of the B.pdf
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Author(s)
Sciolla, Gabriella
Flood, Kevin T.
Cowan, Ray F
Dujmic, Denis
Date Issued
October 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P., V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, B. Stugu, et al. “Measurement of the B[superscript +] → ωℓ[superscript +]ν branching fraction with semileptonically tagged B mesons.” Physical Review D 88, no. 7 (October 2013). © 2013 American Physical Society
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Final published version
Abstract
We report a measurement of the branching fraction of the exclusive charmless semileptonic decay B[superscript +]→ ωℓ[superscript +]ν, where ℓ is either an electron or a muon. We use samples of B[superscript +] 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[superscript −1] of e[superscript +]e[superscript −] collisions at a center-of-mass energy of 10.58 GeV recorded with the BABAR detector at the PEP-II asymmetric-energy e[superscript +]e[superscript −] storage rings. We measure a branching fraction of B(B[superscript +] → ωℓ[superscript +]ν) = (1.35 ± 0.21 ± 0.11) × 10[superscript −4], where the uncertainties are statistical and systematic, respectively. We also present measurements of the partial branching fractions in three bins of q[superscript 2], the invariant-mass squared of the lepton-neutrino system, and we compare them to theoretical predictions of the form factors.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.88.072006
