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Title
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Measurement of top quark pair production in association with a Z boson in proton-proton collisions at √s=13 TeV
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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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 sigma (ttZ) = 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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Language
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English
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Source (journal)
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Journal of high energy physics. - Bristol
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Publication
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Bristol
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2020
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ISSN
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1126-6708
1029-8479
[online]
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DOI
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10.1007/JHEP03(2020)056
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Volume/pages
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3
(2020)
, 50 p.
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ISI
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000519956200002
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Full text (Publisher's DOI)
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Full text (open access)
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