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

2016-01-18Journal article Open access
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dc.contributor.authorCMS collaboration (2307 authors)
dc.contributor.authorHollar, Jonathan
dc.contributor.authorCalpas, Betty
dc.contributor.authorNayak, Aruna
dc.contributor.authorBargassa, Pedrame
dc.contributor.authorBeirão Da Cruz E Silva, Cristóvão
dc.contributor.authorDi Francesco, Agostino
dc.contributor.authorFaccioli, Pietro
dc.contributor.authorFerreira Parracho, Pedro Guilherme
dc.contributor.authorGallinaro, Michele
dc.contributor.authorLeonardo, Nuno
dc.contributor.authorLloret Iglesias, Lara
dc.contributor.authorNguyen, Federico
dc.contributor.authorRodrigues Antunes, Joao
dc.contributor.authorSeixas, Joao
dc.contributor.authorToldaiev, Oleksii
dc.contributor.authorVadruccio, Daniele
dc.contributor.authorVarela, Joao
dc.contributor.authorVischia, Pietro
dc.contributor.authorDavid Tinoco Mendes, Andre
dc.contributor.authorSilva, Pedro
dc.contributor.authorMusella, Pasquale
dc.contributor.authorPela, Joao
dc.date.accessioned2019-02-04T08:18:05Z
dc.date.available2019-02-04T08:18:05Z
dc.date.issued2016-01-18
dc.date.updated2019-02-04T08:18:05Z
dc.description.abstractMeasurements 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.
dc.description.versionPeer Reviewed
dc.identifierJHEP 1601 (2016) 096 JHEP 01 (2016) 096; DOI 10.1007/JHEP01(2016)096
dc.identifier.urihttp://dx.doi.org/10.1007/JHEP01(2016)096
dc.identifier.urihttp://hdl.handle.net/10400.26/26946
dc.language.isoeng
dc.titleObservation of top quark pairs produced in association with a vector boson in pp collisions at $ \sqrt{s}=8 $ TeV
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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