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

dc.contributor.authorCMS Collaboration
dc.contributor.authorBuccilli, A.
dc.contributor.authorCooper, S.I.
dc.contributor.authorHenderson, C.
dc.contributor.authorRumerio, P.
dc.contributor.authorWest, C.
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2022-08-02T15:20:04Z
dc.date.available2022-08-02T15:20:04Z
dc.date.issued2018
dc.description.abstractA 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 \(\sigma \left(t\overline{t}W\right)={0.77}_{-0.11}^{+0.12}{\left(\mathrm{stat}\right)}_{-0.12}^{+0.13}\left(\mathrm{syst}\right)pb\) and \(\sigma \left(t\overline{t}Z\right)={0.99}_{-0.08}^{+0.09}{\left(\mathrm{stat}\right)}_{-0.10}^{+0.12}\left(\mathrm{syst}\right)pb\). The expected (observed) signal significance for the \(t\overline{t}W\) production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the \(t\overline{t}Z\) 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 \(t\overline{t}W\) and \(t\overline{t}Z\) production.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationSirunyan, 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., … Woods, N. (2018). 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. In Journal of High Energy Physics (Vol. 2018, Issue 8). Springer Science and Business Media LLC. https://doi.org/10.1007/jhep08(2018)011
dc.identifier.doi10.1007/JHEP08(2018)011
dc.identifier.urihttps://ir.ua.edu/handle/123456789/9046
dc.languageEnglish
dc.language.isoen_US
dc.rights.urihttps://creativecommons.org/licenses/by/3.0
dc.subjectHadron-Hadron scattering (experiments)
dc.subjectTop physics
dc.titleMeasurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at √s = 13 TeVen_US
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