The standard model (SM) production of four top quarks (tt over bar ttover ba in proton-proton collisions is studied by the CMS Collaboration.The data sample, collected during the 2016-2018 data taking of the LHC,corresponds to an integrated luminosity of 137fb-1 at a center-of-massenergy of 13TeV. The events are required to contain two same-signcharged leptons (electrons or muons) or at least three leptons, andjets. The observed and expected significances for the tt over bar ttover bar signal are respectively 2.6 and 2.7 standard deviations, andthe tt over bar tt over bar cross section is measured to be12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling ofthe top quark to the Higgs boson, yielding a limit of < 1. 7 is the SMvalue of yt. They are also used to constrain the oblique parameter ofthe Higgs boson in an effective field theory framework, H. Limits areset on the production of a heavy scalar or pseudoscalar boson in Type-IItwo-Higgs-doublet and simplified dark matter models, with exclusionlimits reaching 350-470GeV and 350-550GeV for scalar and pseudoscalarbosons, respectively. Upper bounds are also set on couplings of the topquark to new light particles.
Search for production of four top quarks in final states with svame-sign or multiple leptons in proton-proton collisions at root s=13 TeV
Albergo, S.;Costa, S.;Potenza, R.;Tricomi, A.;Tuve, C.;
2020-01-01
Abstract
The standard model (SM) production of four top quarks (tt over bar ttover ba in proton-proton collisions is studied by the CMS Collaboration.The data sample, collected during the 2016-2018 data taking of the LHC,corresponds to an integrated luminosity of 137fb-1 at a center-of-massenergy of 13TeV. The events are required to contain two same-signcharged leptons (electrons or muons) or at least three leptons, andjets. The observed and expected significances for the tt over bar ttover bar signal are respectively 2.6 and 2.7 standard deviations, andthe tt over bar tt over bar cross section is measured to be12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling ofthe top quark to the Higgs boson, yielding a limit of < 1. 7 is the SMvalue of yt. They are also used to constrain the oblique parameter ofthe Higgs boson in an effective field theory framework, H. Limits areset on the production of a heavy scalar or pseudoscalar boson in Type-IItwo-Higgs-doublet and simplified dark matter models, with exclusionlimits reaching 350-470GeV and 350-550GeV for scalar and pseudoscalarbosons, respectively. Upper bounds are also set on couplings of the topquark to new light particles.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
