Observation of top quark pairs produced in association with a vector boson in pp collisions at √(s) = 8 TeV

Khachatryan, Vardan

doi:10.1007/JHEP01(2016)096

Title: Observation of top quark pairs produced in association with a vector boson in pp collisions at √(s) = 8 TeV

Journal Article · Mon Jan 18 00:00:00 EST 2016 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP01(2016)096· OSTI ID:1226331

Khachatryan, Vardan ^[1]

Yerevan Physics Inst. (YerPhI) (Armenia). et al.

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.

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Research Organization:: 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 Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: CMS Collaboration; CMS

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1226331

Alternate ID(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; arXiv eprint number arXiv:1510.01131

Journal Information:: Journal of High Energy Physics (Online), Vol. 2016, Issue 96; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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