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| CMS-TOP-12-014 ; CERN-PH-EP-2013-033 | ||
| Measurement of associated production of vector bosons and tˉt at √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 √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 tˉtZ events and a same-sign dilepton analysis of tˉtV (V= W or Z) events. In the trilepton channel a direct measurement of the tˉtZ cross section σtˉtZ = 0.28 +0.14−0.11 (stat.) +0.06−0.03 (syst.) pb is obtained. In the dilepton channel a measurement of the tˉtV cross section yields σtˉtV = 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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