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

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (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). pp. 1-49. ISSN 1029-8479

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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(t¯tW) = 0.77+0.12 −0.11(stat)+0.13 −0.12(syst) pb and σ(t¯tZ) = 0.99+0.09 −0.08(stat)+0.12 −0.10(syst) pb. The expected (observed) signal significance for the t¯tW production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the t¯tZ production in threeand 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¯tW and t¯tZ production.

Item Type:	Article (Journal)
Additional Information:	7861/66748
Uncontrolled Keywords:	Hadron-Hadron scattering (experiments); Top physics
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	10 Oct 2018 10:02
Last Modified:	10 Oct 2018 10:02
URI:	http://irep.iium.edu.my/id/eprint/66748

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