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Measurement of top quark pair production in association with a Z boson in proton-proton collisions at √s = 13 TeV

  • Author(s): Sirunyan, AM
  • Tumasyan, A
  • Adam, W
  • Ambrogi, F
  • Bergauer, T
  • Brandstetter, J
  • Dragicevic, M
  • Erö, J
  • Escalante Del Valle, A
  • Flechl, M
  • Frühwirth, R
  • Jeitler, M
  • Krammer, N
  • Krätschmer, I
  • Liko, D
  • Madlener, T
  • Mikulec, I
  • Rad, N
  • Schieck, J
  • Schöfbeck, R
  • Spanring, M
  • Spitzbart, D
  • Waltenberger, W
  • Wulz, CE
  • Zarucki, M
  • Drugakov, V
  • Mossolov, V
  • Suarez Gonzalez, J
  • Darwish, MR
  • De Wolf, EA
  • Di Croce, D
  • Janssen, X
  • Lauwers, J
  • Lelek, A
  • Pieters, M
  • Rejeb Sfar, H
  • Van Haevermaet, H
  • Van Mechelen, P
  • Van Putte, S
  • Van Remortel, N
  • Blekman, F
  • Bols, ES
  • Chhibra, SS
  • D’Hondt, J
  • De Clercq, J
  • Lontkovskyi, D
  • Lowette, S
  • Marchesini, I
  • Moortgat, S
  • Moreels, L
  • Python, Q
  • Skovpen, K
  • Tavernier, S
  • Van Doninck, W
  • Van Mulders, P
  • Van Parijs, I
  • Beghin, D
  • Bilin, B
  • Brun, H
  • Clerbaux, B
  • De Lentdecker, G
  • Delannoy, H
  • Dorney, B
  • Favart, L
  • Grebenyuk, A
  • Kalsi, AK
  • Luetic, J
  • Popov, A
  • Postiau, N
  • Starling, E
  • Thomas, L
  • Vander Velde, C
  • Vanlaer, P
  • Vannerom, D
  • Wang, Q
  • Cornelis, T
  • Dobur, D
  • Khvastunov, I
  • Roskas, C
  • Trocino, D
  • Tytgat, M
  • Verbeke, W
  • Vermassen, B
  • Vit, M
  • Zaganidis, N
  • Bondu, O
  • Bruno, G
  • Caputo, C
  • David, P
  • Delaere, C
  • Delcourt, M
  • Giammanco, A
  • Lemaitre, V
  • Magitteri, A
  • Prisciandaro, J
  • Saggio, A
  • Vidal Marono, M
  • Vischia, P
  • Zobec, J
  • Alves, FL
  • et al.
Abstract

© 2020, The Author(s). 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(t t ¯ 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. [Figure not available: see fulltext.]

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