Journal Article Measurement of the tt¯Ztt¯Z and tt¯Wtt¯W production cross sections in multilepton final states using 3.2 fb−1 of pppp collisions at s√ = 13 TeV with the ATLAS detector

ATLAS Collaboration  ,  Hara, K.  ,  Kim, S.H.  ,  Okawa, H.  ,  Sato, K.  ,  Ukegawa, F.

77 ( 1 )  , p.40 , 2017-01 , Springer Berlin Heidelberg
A measurement of the tt¯Z and tt¯W production cross sections in final states with either two same-charge muons, or three or four leptons (electrons or muons) is presented. The analysis uses a data sample of proton–proton collisions at s√=13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015, corresponding to a total integrated luminosity of 3.2 fb−1. The inclusive cross sections are extracted using likelihood fits to signal and control regions, resulting in σtt¯Z=0.9±0.3 pb and σtt¯W=1.5±0.8 pb, in agreement with the Standard Model predictions.

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