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Title: 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 $$\sigma(\mathrm{t}\overline{\mathrm{t}}\mathrm{W})= 0.77^{+0.12}_{-0.11}\text{(stat)}^{+0.13}_{-0.12}\text{(syst)}$$ pb and $$\sigma(\mathrm{t}\overline{\mathrm{t}}\mathrm{Z})=0.99^{+0.09}_{-0.08}\text{(stat)}^{+0.12}_{-0.10}\text{(syst)}$$ pb. The expected (observed) signal significance for the $$\mathrm{t}\overline{\mathrm{t}}\mathrm{W}$$ production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the $$\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}$$ 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 $$\mathrm{t}\overline{\mathrm{t}}\mathrm{W}$$ and $$\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}$$ production.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS
OSTI Identifier:
1409373
Report Number(s):
FERMILAB-PUB-17-529-CMS; CMS-TOP-17-005; CERN-EP-2017-286; arXiv:1711.02547
1634843
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Sirunyan, Albert M, and et al. 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. United States: N. p., 2017. Web.
Sirunyan, Albert M, & et al. 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. United States.
Sirunyan, Albert M, and et al. Tue . "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". United States. doi:. https://www.osti.gov/servlets/purl/1409373.
@article{osti_1409373,
title = {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},
author = {Sirunyan, Albert M and et al.},
abstractNote = {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 $\sigma(\mathrm{t}\overline{\mathrm{t}}\mathrm{W})= 0.77^{+0.12}_{-0.11}\text{(stat)}^{+0.13}_{-0.12}\text{(syst)}$ pb and $\sigma(\mathrm{t}\overline{\mathrm{t}}\mathrm{Z})=0.99^{+0.09}_{-0.08}\text{(stat)}^{+0.12}_{-0.10}\text{(syst)}$ pb. The expected (observed) signal significance for the $\mathrm{t}\overline{\mathrm{t}}\mathrm{W}$ production in same-sign dilepton channel is found to be 4.5 (5.3) standard deviations, while for the $\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}$ 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 $\mathrm{t}\overline{\mathrm{t}}\mathrm{W}$ and $\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}$ production.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 07 00:00:00 EST 2017},
month = {Tue Nov 07 00:00:00 EST 2017}
}