Observation of top quark pairs produced in association with a vector boson in pp collisions at $ \sqrt{s}=8 $ TeV - INSPIRE

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Observation of top quark pairs produced in association with a vector boson in pp collisions at $\sqrt{s}=8$ TeV

CMS

Collaboration

Oct 5, 2015

52 pages

Published in:

JHEP 01 (2016) 096

Published: Jan 18, 2016

e-Print:

1510.01131 [hep-ex]

DOI:

10.1007/JHEP01(2016)096

Report number:

CMS-TOP-14-021,
CERN-PH-EP-2015-248

Experiments:

CERN-LHC-CMS

View in:

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Abstract: (Springer)

Measurements of the cross sections for top quark pairs produced in association with a W or Z boson are presented, using 8 TeV pp collision data corresponding to an integrated luminosity of 19.5 fb

^{−1}

, collected by the CMS experiment at the LHC. Final states are selected in which the associated W boson decays to a charged lepton and a neutrino or the Z boson decays to two charged leptons. Signal events are identified by matching reconstructed objects in the detector to specific final state particles from

\mathrm{t}\overline{\mathrm{t}}\mathrm{W}

or

\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}

decays. The

\mathrm{t}\overline{\mathrm{t}}\mathrm{W}

cross section is measured to be 382

_{− 102}^{+ 117}

fb with a significance of 4.8 standard deviations from the background-only hypothesis. The

\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}

cross section is measured to be 242

_{− 55}^{+ 65}

fb with a significance of 6.4 standard deviations from the background-only hypothesis. These measurements are used to set bounds on five anomalous dimension-six operators that would affect the

\mathrm{t}\overline{\mathrm{t}}\mathrm{W}

and

\mathrm{t}\overline{\mathrm{t}}\mathrm{Z}

cross sections.

Note:

Replaced with published version. Added journal reference and DOI

Electroweak interaction
Hadron-Hadron scattering
Top physics
p p: scattering
p p: colliding beams
top: pair production
vector boson: associated production
vector boson: leptonic decay
W: leptonic decay
Z0: leptonic decay

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