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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. 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 (Formula Presented) fb with a significance of 4.8 standard deviations from the background-only hypothesis. The tt?Z cross section is measured to be (Formula Presented) 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.
Fuente: Journal of High Energy Physics, Vol. 2016, Num. 1, Art. Num. 096
Editorial: Springer Verlag
Fecha de publicación: 01/01/2016
Nº de páginas: 55
Tipo de publicación: Artículo de Revista
DOI: 10.1007/JHEP01(2016)096
ISSN: 1126-6708,1029-8479
Url de la publicación: https://doi.org/10.1007/JHEP01(2016)096
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ANA YAIZA RODRIGUEZ MARRERO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
IVAN VILA ALVAREZ
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