Measurement of the ttZ production cross section in the three lepton final state with 13.0 fb−¹ of √s = 8 TeV pp collision data collected by the ATLAS detector

Arash Khazraie Zamanpour
2012
A measurement of the ttZ production cross section with the ATLAS detector in pp collisions at the LHC is presented. The search is performed on 13.0 fb−¹ of data collected in 2012. Only final states with three leptons are considered, in which the Z boson decays to a pair of leptons and one of the W bosons coming from t → bW decays gives rise to a lepton after decay. An excess of 8.95 ± 0.62 (stat) +0.37 -0.59(sys) events above background is observed with a significance of 3.64 standard
more » ... above zero. We have assumed no statistical error on the acceptance or efficiency of detection. In the trilepton channel, a direct measurement of the ttZ production cross section of σ = 254 ± 104 (stat) ± 19 (sys) fb is obtained.
doi:10.14288/1.0073636 fatcat:4fhcif2geraczgfu2bt5mhe4na