Observation of the Decay B-→Ds(*)+K-ℓ-ν̅ ℓ
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Sanchez-2011-Observation of the Decay B.pdf
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Author(s)
Dujmic, Denis
Sciolla, Gabriella
Zhao, M.
Fisher, Peter H
Cowan, Ray F
Date Issued
January 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
del Amo Sanchez, P. et al. “Observation of the Decay B^{-}→D_{s}^{(*)+}K^{-}ℓ^{-}ν[over ¯]_{ℓ}.” Physical Review Letters 107 (2011): n. pag. Web. 30 Nov. 2011. © 2011 American Physical Society
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Final published version
Abstract
We report the observation of the decay B[superscript -]→D[subscript s][superscript (*)+]K[superscript -]ℓ[superscript -]ν̅ ℓ based on 342 fb[superscript -1] of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e[superscript +]e[superscript -] storage rings at SLAC. A simultaneous fit to three D[subscript s][superscript +] decay chains is performed to extract the signal yield from measurements of the squared missing mass in the B meson decay. We observe the decay B[superscript -]→D[subscript s][superscript (*)+]K[superscript -]ℓ[superscript -]ν̅ ℓ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B[superscript -]→D[subscript s][superscript (*)+]K[superscript -]ℓ[superscript -]ν̅ ℓ)=[6.13[subscript -1.03][superscript +1.04](stat)±0.43(syst)±0.51(B(D[subscript s]))]×10[superscript -4], where the last error reflects the limited knowledge of the D[subscript s] branching fractions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.107.041804
