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    Measurement of associated W + charm production in pp collisions at s√ = 7 TeV

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    CMS_associated_w2014.pdf (1.138Mb)
    Issue Date
    2014-02
    Author
    CMS Collaboration
    Sanders, Stephen J.
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    Measurements are presented of the associated production of a W boson and a charm-quark jet (W + c) in pp collisions at a center-of-mass energy of 7 TeV. The analysis is conducted with a data sample corresponding to a total integrated luminosity of 5 fb−1, collected by the CMS detector at the LHC. W boson candidates are identified by their decay into a charged lepton (muon or electron) and a neutrino. The W + c measurements are performed for charm-quark jets in the kinematic region pjetT > 25 GeV, |ηjet| < 2.5, for two different thresholds for the transverse momentum of the lepton from the W-boson decay, and in the pseudorapidity range |ηℓ| < 2.1. Hadronic and inclusive semileptonic decays of charm hadrons are used to measure the following total cross sections: σ(pp → W + c + X) × B(W → ℓν) = 107.7 ± 3.3 (stat.) ± 6.9 (syst.) pb (pℓT > 25 GeV) and σ(pp → W + c + X)×B(W → ℓν) = 84.1 ± 2.0 (stat.) ± 4.9 (syst.) pb (pℓT > 35 GeV), and the cross section ratios σ(pp → W+ + c¯¯ + X)/σ(pp → W− + c + X) = 0.954 ± 0.025 (stat.) ± 0.004 (syst.) (pℓT > 25 GeV) and σ(pp → W+ + c¯¯ + X)/σ(pp → W− + c + X) = 0.938 ± 0.019 (stat.) ± 0.006 (syst.) (pℓT > 35 GeV). Cross sections and cross section ratios are also measured differentially with respect to the absolute value of the pseudorapidity of the lepton from the W-boson decay. These are the first measurements from the LHC directly sensitive to the strange quark and antiquark content of the proton. Results are compared with theoretical predictions and are consistent with the predictions based on global fits of parton distribution functions.
    Description
    This is the published version.
    URI
    http://hdl.handle.net/1808/19315
    DOI
    https://doi.org/10.1007/JHEP02(2014)013
    Collections
    • Physics and Astronomy Scholarly Works [1587]
    Citation
    The CMS collaboration. "Measurement of associated W + charm production in pp collisions at s√ = 7 TeV." Journal of High Energy Physics. February, 2014: v5 n2. http://dx.doi.org/10.1007/JHEP02(2014)013

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    KU Libraries
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    785-864-8983

    KU Libraries
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    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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