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 - INSPIRE

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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

CMS

Collaboration

Nov 7, 2017

46 pages

Published in:

JHEP 08 (2018) 011

e-Print:

1711.02547 [hep-ex]

DOI:

10.1007/JHEP08(2018)011 (publication)

PDG:

{{\mathit t}}{{\overline{\mathit t}}}{{\mathit W}}

Production Cross Section in

{{\mathit p}}{{\mathit p}}

\sqrt {s }

Report number:

CMS-TOP-17-005,
CERN-EP-2017-286

Experiments:

CERN-LHC-CMS

View in:

reference search214 citations

Citations per year

Abstract: (arXiv)

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.

Note:

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-17-005 (CMS Public Pages)

p p: colliding beams
top: pair production
W: associated production
Z0: associated production
W: leptonic decay
Z0: leptonic decay
lepton: multiplicity
dilepton: same sign
final state: ((n)jet dilepton)
final state: ((n)jet 3lepton)

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