Measurement of the t¯tZ and t¯tW cross sections in proton-proton collisions at √s=13 TeV with the ATLAS detector
TypePeer reviewed; Journal article
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A measurement of the associated production of a top-quark pair ( t ¯ t ) with a vector boson ( W , Z ) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented, using 36.1 fb − 1 of integrated luminosity collected by the ATLAS detector at the Large Hadron Collider. Events are selected in channels with two same- or opposite-sign leptons (electrons or muons), three leptons or four leptons, and each channel is further divided into multiple regions to maximize the sensitivity of the measurement. The t ¯ t Z and t ¯ t W production cross sections are simultaneously measured using a combined fit to all regions. The best-fit values of the production cross sections are σ t ¯ t Z = 0.95 ± 0.0 8 stat ± 0.1 0 syst pb and σ t ¯ t W = 0.87 ± 0.1 3 stat ± 0.1 4 syst pb in agreement with the Standard Model predictions. The measurement of the t ¯ t Z cross section is used to set constraints on effective field theory operators which modify the t ¯ t Z vertex.
CitationAaboud M, Aad G, Abbott B, Abbott DC, Abdinov OBo, Abeloos B, Abhayasinghe DK, Abidi SH, AbouZeid H, Abraham NL, Buanes T, Djuvsland JI, Eigen G, Fomin N, Lipniacka A, Martin dit Latour B, Mæland S, Stugu B, Yang Z, Bugge MK, Cameron DG, Catmore JR, Feigl S, Garonne V, Gramstad E, Hellesund S, Morisbak V, Oppen H, Ould-Saada F, Pedersen M, Read AL, Røhne OM, Sandaker H, Serfon C, Vadla KOH, Abramowicz H, Abreu H, Abulaiti Y, Acharya BS, Adachi S, Adam L, Adamczyk L, Adamek L, Adelman J, Adersberger M, Adigüzel A, Adye T, Affolder AA, Afik Y, Agheorghiesei C, ATLAS C. Measurement of the t¯tZ and t¯tW cross sections in proton-proton collisions at √s=13 TeV with the ATLAS detector. Physical Review D. 2019;99:072009
Copyright 2019 CERN, for the ATLAS Collaboration