A 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+0.12−0.11(stat)+0.13−0.12(syst) pb and σ(tt⎯⎯Z)=0.99+0.09−0.08(stat)+0.12−0.10(syst) pb. The expected (observed) signal significance for the tt⎯⎯W production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the tt⎯⎯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 tt⎯⎯W and tt⎯⎯Z production.

Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). 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 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018(8), 1-49 [10.1007/JHEP08(2018)011].

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 TeV

Battilana, C.;Bonacorsi, D.;Borgonovi, L.;Braibant-Giacomelli, S.;Capiluppi, P.;Castro, A.;Cuffiani, M.;Fanfani, A.;Fasanella, D.;Guiducci, L.;Masetti, G.;Navarria, F. L.;Rossi, A. M.;Rovelli, T.;Siroli, G. P.;Tosi, N.;
2018

Abstract

A 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+0.12−0.11(stat)+0.13−0.12(syst) pb and σ(tt⎯⎯Z)=0.99+0.09−0.08(stat)+0.12−0.10(syst) pb. The expected (observed) signal significance for the tt⎯⎯W production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the tt⎯⎯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 tt⎯⎯W and tt⎯⎯Z production.
2018
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2018). 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 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2018(8), 1-49 [10.1007/JHEP08(2018)011].
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Escalante De...espandi
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