Measurement of top quark pair production in association with a Z boson in proton-proton collisions at s√ = 13 TeV
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Issue Date
2020-03-10Author
CMS Collaboration
Publisher
Springer
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
Copyright CERN, for the benefit of the CMS Collaboration. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0).
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A measurement of the inclusive cross section of top quark pair production in association with a Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC is performed. The data sample corresponds to an integrated luminosity of 77.5 fb−1, collected by the CMS experiment during 2016 and 2017. The measurement is performed using final states containing three or four charged leptons (electrons or muons), and the Z boson is detected through its decay to an oppositely charged lepton pair. The production cross section is measured to be σ(tt¯Z) = 0.95 ± 0.05 (stat) ± 0.06 (syst) pb. For the first time, differential cross sections are measured as functions of the transverse momentum of the Z boson and the angular distribution of the negatively charged lepton from the Z boson decay. The most stringent direct limits to date on the anomalous couplings of the top quark to the Z boson are presented, including constraints on the Wilson coefficients in the framework of the standard model effective field theory.
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Citation
The CMS collaboration., Sirunyan, A.M., Tumasyan, A. et al. Measurement of top quark pair production in association with a Z boson in proton-proton collisions at s√ = 13 TeV. J. High Energ. Phys. 2020, 56 (2020). https://doi.org/10.1007/JHEP03(2020)056
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