Measurement of the B0→π-ℓ+ν and B+→η(′)ℓ+ν branching fractions, the B0→π-ℓ+ν and B+→ηℓ+ν form-factor shapes, and determination of |Vub|
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Sanchez-2011-Measurement of the B.pdf
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Author(s)
Dujmic, Denis
Sciolla, Gabriella
Zhao, M.
Cowan, Ray F
Date Issued
March 2011
Journal
Physical Review D
Publisher
American Physical Society
Citation
del Amo Sanchez, P. et al. “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}|.” Physical Review D 83 (2011): n. pag. Web. 8 Dec. 2011. © 2011 American Physical Society
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Final published version
Abstract
We report the results of a study of the exclusive charmless semileptonic decays, B[superscript +]→η[superscript (′)]ℓ[superscript +]ν and B[superscript 0]→π[superscript -]ℓ[superscript +]ν, undertaken with approximately 464×10[superscript 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[superscript +]→ηℓ[superscript +]ν and B[superscript 0]→π-ℓ[superscript +]ν decays in three and 12 bins of q[superscript 2], respectively, from which we extract the f+(q[superscript 2]) form-factor shapes and the total branching fractions B(B[superscript +]→ηℓ[superscript +]ν)=(0.36±0.05[subscript stat]±0.04[subscript syst])×10[superscript -4] and B(B[superscript 0]→π[superscript -]ℓ[superscript +]ν)=(1.42±0.05[subscript stat]±0.07[subscript syst])×10[superscript -4]. We also measure B(B[superscript +]→η[superscript ′]ℓ[superscript +]ν)=(0.24±0.08[subscript stat]±0.03[subscript syst])×10[superscript -4]. We obtain values for the magnitude of the CKM matrix element |V[subscript ub]| using three different QCD calculations.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.83.052011
