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    Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at s√=8 TeV

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    Bean_quark-antiquark2014.pdf (640.7Kb)
    Issue Date
    2014-09-17
    Author
    CMS Collaboration
    Bean, Alice
    Publisher
    Springer Verlag
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    A measurement of the cross section for the production of top quark–antiquark pairs (tt¯) in association with a vector boson V (W or Z) in proton-proton collisions at s√=8 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb−1 recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and μ) channels: a same-sign dilepton analysis targeting tt¯W events, and trilepton and four-lepton analyses designed for tt¯Z events. In the same-sign dilepton channel, the tt¯W cross section is measured as σtt¯W=170+90−80(stat)±70(syst)fb, corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the tt¯Z cross section, σtt¯Z=200+80−70(stat)+40−30(syst)fb−1, is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive tt¯V process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.
    Description
    This is the published version.
    URI
    http://hdl.handle.net/1808/19349
    DOI
    https://doi.org/10.1140/epjc/s10052-014-3060-7
    Collections
    • Physics & Astronomy Scholarly Works [1715]
    Citation
    The CMS Collaboration. "Measurement of top quark–antiquark pair production in association with a W or Z boson in pp collisions at s√=8 TeV." The European Physical Journal C. September, 2014: v74(9). http://dx.doi.org/10.1140/epjc/s10052-014-3060-7

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    785-864-8983
    KU Libraries
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    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    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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