Compact Muon Solenoid
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| CMS-TOP-12-014 ; CERN-PH-EP-2013-033 | ||
| Measurement of associated production of vector bosons and $ \mathrm{ t \bar{t} } $ at $\sqrt{s}$= 7 TeV | ||
| CMS Collaboration | ||
| 13 March 2013 | ||
| Phys. Rev. Lett. 110 (2013) 172002 | ||
| Abstract: The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 7 TeV is presented. The results are based on a dataset corresponding to an integrated luminosity of 5.0 inverse femtobarns, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of $t\bar{t}$Z events and a same-sign dilepton analysis of $t\bar{t}$V (V= W or Z) events. In the trilepton channel a direct measurement of the $t\bar{t}$Z cross section $\sigma_{t\bar{t}Z}$ = 0.28 $^{+0.14}_{-0.11}$ (stat.) $^{+0.06}_{-0.03}$ (syst.) pb is obtained. In the dilepton channel a measurement of the $t\bar{t}$V cross section yields $\sigma_{t\bar{t}V}$ = 0.43 $^{+0.17}_{-0.15}$ (stat.) $^{+0.09}_{-0.07}$ (syst.) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding NLO predictions of 0.137 $^{+0.012}_{-0.016}$ and 0.306 $^{+0.031}_{-0.053}$ pb. | ||
| Links: e-print arXiv:1303.3239 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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