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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 137fb-1 at a center-of-mass energy of 13TeV. 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 is measured to be 12.6+5.8?5.2fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, yt, yielding a limit of |yt/ySMt|<1.7 at 95% confidence level, where ySMt is the SM value of yt. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, H^<0.12. Limits are set on the production of a heavy scalar or pseudoscalar boson in Type-II two-Higgs-doublet and simplified dark matter models, with exclusion limits reaching 350?470GeV and 350?550GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.
Fuente: Eur. Phys. J. C 80, 75 (2020)
Editorial: Springer New York LLC
Fecha de publicación: 01/02/2020
Nº de páginas: 31
Tipo de publicación: Artículo de Revista
DOI: 10.1140/epjc/s10052-019-7593-7
ISSN: 1434-6044,1434-6052
Url de la publicación: https://doi.org/10.1140/epjc/s10052-019-7593-7
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SIRUNYAN, A. M.
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
BARBARA CHAZIN QUERO
JORGE DUARTE CAMPDERROS
MARCOS FERNANDEZ GARCIA
PEDRO JOSE FERNANDEZ MANTECA
ANDREA GARCIA ALONSO
GERVASIO GOMEZ GRAMUGLIO
CELSO MARTINEZ RIVERO
PABLO MARTINEZ RUIZ DEL ARBOL
FRANCISCO MATORRAS WEINIG
JONATAN PIEDRA GOMEZ
CEDRIC GERALD PRIEELS
MARIA TERESA RODRIGO ANORO
ALBERTO RUIZ JIMENO
LORENZO RUSSO
LUCA SCODELLARO
NICOLO TREVISANI
IVAN VILA ALVAREZ
JESUS MANUEL VIZAN GARCIA
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