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

The CMS Collaboration

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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 (Formula presented.) events. In the same-sign dilepton channel, the (Formula presented.) cross section is measured as (Formula presented.), 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 (Formula presented.) cross section, (Formula presented.), 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 (Formula presented.) process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.

Original languageEnglish
Article number3060
JournalEuropean Physical Journal C
Issue number9
Publication statusPublished - 2014 Sep 1

Bibliographical note

Publisher Copyright:
© 2014, The Author(s).

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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