Observation of top quark pairs produced in association with a vector boson in pp collisions at √(s) = 8 TeV
Abstract
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. We found that 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 tt-W or tt-Z decays. The tt-W cross section is measured to be 382+117 -102 fb with a significance of 4.8 standard deviations from the background-only hypothesis. The tt-Z cross section is measured to be 242+65 -55 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 tt-W and tt-Z cross sections.
- Authors:
-
- Yerevan Physics Inst. (YerPhI) (Armenia). et al.
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Org.:
- CMS Collaboration; CMS
- OSTI Identifier:
- 1226331
- Alternate Identifier(s):
- OSTI ID: 1334975
- Report Number(s):
- FERMILAB-PUB-15-468-CMS; FERMILAB-PUB-16-586-CMS; CMS-SMP-14-013; CERN-EP-2016-256; arXiv:1611.03844
Journal ID: ISSN 1029-8479; arXiv eprint number arXiv:1510.01131
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 96; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Khachatryan, Vardan. Observation of top quark pairs produced in association with a vector boson in pp collisions at √(s) = 8 TeV. United States: N. p., 2016.
Web. doi:10.1007/JHEP01(2016)096.
Khachatryan, Vardan. Observation of top quark pairs produced in association with a vector boson in pp collisions at √(s) = 8 TeV. United States. https://doi.org/10.1007/JHEP01(2016)096
Khachatryan, Vardan. Mon .
"Observation of top quark pairs produced in association with a vector boson in pp collisions at √(s) = 8 TeV". United States. https://doi.org/10.1007/JHEP01(2016)096. https://www.osti.gov/servlets/purl/1226331.
@article{osti_1226331,
title = {Observation of top quark pairs produced in association with a vector boson in pp collisions at √(s) = 8 TeV},
author = {Khachatryan, Vardan},
abstractNote = {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. We found that 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 tt-W or tt-Z decays. The tt-W cross section is measured to be 382+117 -102 fb with a significance of 4.8 standard deviations from the background-only hypothesis. The tt-Z cross section is measured to be 242+65 -55 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 tt-W and tt-Z cross sections.},
doi = {10.1007/JHEP01(2016)096},
journal = {Journal of High Energy Physics (Online)},
number = 96,
volume = 2016,
place = {United States},
year = {Mon Jan 18 00:00:00 EST 2016},
month = {Mon Jan 18 00:00:00 EST 2016}
}
Web of Science
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