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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

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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