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Observation of the Decay B−→D(*)+sK−ℓ−ν[bar]ℓ

We report the observation of the decay B−→D(*)+sK−ℓ−ν[bar]ℓ based on 342 fb−1 of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e+e− storage rings at SLAC. A simultaneous fit to three D+s decay chains is performed to extract the signal yield from measurements of the squa...

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Bibliographic Details
Main Authors: Amo Sanchez, Pablo del (Author) , Marks, Jörg (Author) , Schenk, Sebastian (Author) , Uwer, Ulrich (Author)
Corporate Author: BABAR Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 22 July 2011
In: Physical review letters
Year: 2011, Volume: 107, Issue: 4, Pages: 1-8
ISSN:1079-7114
DOI:10.1103/PhysRevLett.107.041804
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.107.041804
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.107.041804
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Author Notes:BABAR Collaboration*

MARC

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520 |a We report the observation of the decay B−→D(*)+sK−ℓ−ν[bar]ℓ based on 342 fb−1 of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e+e− storage rings at SLAC. A simultaneous fit to three D+s 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−→D(*)+sK−ℓ−ν[bar]ℓ with a significance greater than 5 standard deviations (including systematic uncertainties) and measure its branching fraction to be B(B−→D(*)+sK−ℓ−ν[bar]ℓ)=[6.13+1.04−1.03(stat)±0.43(syst)±0.51(B(Ds))]×10−4, where the last error reflects the limited knowledge of the Ds branching fractions. 
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