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 t/tW or t/tZ decays. The t/tW cross section is measured to be 382 - 102 + 117 fb with a significance of 4.8 standard deviations from the background-only hypothesis. The t/tZ 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 t/tW and t/tZ cross sections.

Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Observation of top quark pairs produced in association with a vector boson in pp collisions at s = 8 $$ \sqrts=8 $$ TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2016(1), 096-1-096-54 [10.1007/JHEP01(2016)096].

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

BONACORSI, DANIELE;BRAIBANT, SYLVIE;CAMPANINI, RENATO;CAPILUPPI, PAOLO;CASTRO, ANDREA;CODISPOTI, GIUSEPPE;CUFFIANI, MARCO;FANFANI, ALESSANDRA;FASANELLA, DANIELE;GUIDUCCI, LUIGI;MASETTI, GIANNI;NAVARRIA, FRANCESCO LUIGI;ROSSI, ANTONIO MARIA;ROVELLI, TIZIANO;SIROLI, GIAN PIERO;
2016

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 t/tW or t/tZ decays. The t/tW cross section is measured to be 382 - 102 + 117 fb with a significance of 4.8 standard deviations from the background-only hypothesis. The t/tZ 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 t/tW and t/tZ cross sections.
2016
Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). Observation of top quark pairs produced in association with a vector boson in pp collisions at s = 8 $$ \sqrts=8 $$ TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2016(1), 096-1-096-54 [10.1007/JHEP01(2016)096].
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/536725
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