Measurement of the tt¯Z and tt¯W production cross sections in multilepton final states using 3.2 fb -1 of pp collisions at s = 13 TeV with the ATLAS detector
M. Aaboud (Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco); G. Aad (CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France); B. Abbott (Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA); J. Abdallah (University of Iowa, Iowa City, IA, USA); O. Abdinov (Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan); et al - Show all 2862 authors
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 protonâproton 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 Ïtt¯Z=0.9±0.3  pb and Ïtt¯W=1.5±0.8  pb, in agreement with the Standard Model predictions.