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Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at √s=13 TeV A. M. Sirunyan, A. Tumasyan, W. Adam [et al.]

Contributor(s): Tumasyan, A | Adam, W | Borchsh, V | Ivanchenko, V | Tcherniaev, E | Sirunyan, A. MMaterial type: ArticleArticleContent type: Текст Media type: электронный Subject(s): топ-кварки | лептоны | протон-протонные столкновенияGenre/Form: статьи в журналах Online resources: Click here to access online In: The European physical journal C Vol. 80, № 2. P. 75 (1-31)Abstract: The standard model (SM) production of four top quarks (tt tt) 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 137 fb−1 at a center-of-mass energy of 13 TeV. The events are required to contain two same-sign charged leptons (electrons or muons) or at least three leptons, and jets. The observed and expected significances for the tt tt signal are respectively 2.6 and 2.7 standard deviations, and the tt tt cross section ismeasured to be 12.6+5.8 −5.2 fb.The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, yt, yielding a limit of |yt/ySM t | < 1.7 at 95% confidence level, where ySM t is the SMvalue of yt. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, Hˆ < 0.12.Limits are set on the production of a heavy scalar or pseudoscalar boson in Type-II two-Higgs-doublet and simplified darkmatter models, with exclusion limits reaching 350–470 GeV and 350–550 GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.
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The standard model (SM) production of four top
quarks (tt tt) 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 137 fb−1 at a center-of-mass energy of
13 TeV. The events are required to contain two same-sign
charged leptons (electrons or muons) or at least three leptons,
and jets. The observed and expected significances for the tt tt
signal are respectively 2.6 and 2.7 standard deviations, and
the tt tt cross section ismeasured to be 12.6+5.8
−5.2 fb.The results
are used to constrain the Yukawa coupling of the top quark
to the Higgs boson, yt, yielding a limit of |yt/ySM
t | < 1.7 at
95% confidence level, where ySM
t is the SMvalue of yt. They
are also used to constrain the oblique parameter of the Higgs
boson in an effective field theory framework, Hˆ < 0.12.Limits
are set on the production of a heavy scalar or pseudoscalar
boson in Type-II two-Higgs-doublet and simplified darkmatter
models, with exclusion limits reaching 350–470 GeV and
350–550 GeV for scalar and pseudoscalar bosons, respectively.
Upper bounds are also set on couplings of the top
quark to new light particles.

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