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| CMS-TOP-12-036 ; CERN-PH-EP-2014-136 | ||
| Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at √s = 8 TeV | ||
| CMS Collaboration | ||
| 30 June 2014 | ||
| Eur. Phys. J. C 74 (2014) 3060 | ||
| Abstract: A measurement of the cross section for the production of top quark-antiquark pairs (tˉt) 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 tˉtW events, and trilepton and four-lepton analyses designed for tˉtZ events. In the same-sign dilepton channel, the tˉtW cross section is measured as σtˉtW = 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 tˉtZ cross section, σtˉtZ= 200 +80−70 (stat) +40−30 (syst) fb, is obtained with a significance of 3.2 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive tˉtV process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels. | ||
| Links: e-print arXiv:1406.7830 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; | ||
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