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Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at √s=13 TeVSirunyan, A.M.Tumasyan, A.Adam, W.Ambrogi, F.Asilar, E.Bergauer, T.Brandstetter, J.Brondolin, E.Dragicevic, M.Erö, J.Escalante Del Valle, A.Flechl, M.Friedl, M.Frühwirth, R.Ghete, V.M.Grossmann, J.Hrubec, J.Jeitler, M.König, A.Krammer, N.Krätschmer, I.Liko, D.Madlener, T.Mikulec, I.Pree, E.Rad, N.Rohringer, H.Schieck, J.Schöfbeck, R.Spanring, M.Spitzbart, D.Waltenberger, W.Wittmann, J.Wulz, C.-E.Zarucki, M.Chekhovsky, V.Mossolov, V.Suarez Gonzalez, J.De Wolf, E.A.Di Croce, D.Janssen, X.Lauwers, J.Van De Klundert, M.Van Haevermaet, H.Van Mechelen, P.Van Remortel, N.Abu Zeid, S.Blekman, F.D’Hondt, J.De Bruyn, I.Hadron-Hadron scattering (experiments)Top physicsA measurement is performed of the cross section of top quark pair production in association with a W or Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb−1, collected by the CMS experiment in 2016. The measurement is performed in the same-sign dilepton, three- and four-lepton final states. The production cross sections are measured to be σ(tt¯W)=0.77−0.11+0.12(stat)−0.12+0.13(syst)pb and σ(tt¯Z)=0.99−0.08+0.09(stat)−0.10+0.12(syst)pb. The expected (observed) signal significance for the t t ¯ W production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the t t ¯ Z production in three- and four-lepton channels both the expected and the observed significances are found to be in excess of 5 standard deviations. The results are in agreement with the standard model predictions and are used to constrain the Wilson coefficients for eight dimension-six operators describing new interactions that would modify t t ¯ W and t t ¯ Z production.[Figure not available: see fulltext.]. © 2018, The Author(s).Springer Verlag2018Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/14356https://doi.org/10.1007/jhep08(2018)0111126-6708enJournal of High Energy Physicsinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/14356