# Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at $\sqrt s$ = 13 TeV

## 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.

## 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.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2018 01 Mar 2019 14:35 01 Mar 2019 14:35 Springer 1029-8479 Gold Publisher DOI. An embargo period may apply. https://doi.org/10.1007/JHEP08(2018)011

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