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A measurement of the production cross-section of a pair of top quarks in association with a W or Z boson is presented, using 20.3fb−1 of pp collision data collected by the ATLAS detector at the LHC, at √ s = 8TeV. The measurement combines four separate analyses which consider final states with two oppositely-charged, two like-charged, three and four leptons. A simultaneous fit to data of the ttW and ttZ signals measures their cross-sections to be σttZ = 176+58 −52 fb and σttW = 369+100 −91 fb, consistent with next-to-leading order theoretical calculations. Tested against the background-only hypothesis, these correspond to an observed (expected) significance of 4.2σ (4.5σ ) for ttZ and 5.0σ (3.2σ ) for ttW .

ttW and ttZ production cross section in leptonic final states at 8TeV with ATLAS