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  • Ambrogi, F.; Spitzbart, D.; Tavernier, S.; Van Parijs, I.; Vanlaer, P.; Roskas, C.; Alves, G. A.; Shopova, M.; Avila, C.; Roguljic, M.; Starodumov, A.; Savoy-Navarro, A.; Amendola, C.; Zabi, A.; Sordini, V.; Sert, H.; Asmuss, P.; Kasemann, M.; Reimers, A.; Baur, S.; Kudella, S.; Katsoulis, P.; Csorgo, T.; Sandeep, K.; Keshri, S.; Bhardwaj, R.; Rout, P. K.; Kapoor, A.; Fiore, L.; Ince, M.; Iemmi, F.; Viliani, L.; Tosi, M.; Montagna, P.; Vai, I.; Vitulo, P.; Spiga, D.; Del Re, D.; Mariotti, C.; Pastrone, N.; Casarsa, M.; Jeon, D.; Carrillo Moreno, S.; Butler, P. H.; Bunkowski, K.; Seixas, J.; Toms, M.; Vlasov, E.; Chadeeva, M.; Dremin, I.; Boos, E.; Blinov, V.; Devetak, D.; Carrillo Montoya, C. A.; Fouz, M. C.; Puerta Pelayo, J.; Folgueras, S.; González Fernández, J. R.; Scodellaro, L.; Deiters, K.; Erdmann, W.; Reitenspiess, T.; Canelli, M. F.; Bakirci, M. N.; Tok, U. G.; Ball, F.; Smith, V. J.; Everaerts, P.; Duh, Y. t.; Narain, M.; Breedon, R.; Erbacher, R.; Lander, R.; Olmedo Negrete, M.; Krutelyov, V.; Yoo, J.; Vorobiev, I.; Pena, C.; Sexton-Kennedy, E.; Bourilkov, D.; Askew, A.; Schiber, C.; Roy, T.; Bowen, J.; Kaadze, K.; Kim, D.; Mitchell, T.; Mohammadi, A.; Narayanan, S.; Niu, X.; Stephans, G. S. F.; Pekkanen, J.; Wightman, A.; Tully, C.; Delannoy, A. G.; Heideman, J.; Spanier, S.; Barria, P.; Neu, C.; Thapa, P.

    The journal of high energy physics, 03/2020, Letnik: 2020, Številka: 3
    Journal Article

    A bstract 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.