Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at root s=13 TeV

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URI: http://hdl.handle.net/10902/24687
ISSN: 1126-6708
ISSN: 1029-8479
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Autoría
Tonon, N.; Brochero Cifuentes, Javier AndrésAutoridad Unican; Cabrillo Bartolomé, José IbanAutoridad Unican; Calderón Tazón, AliciaAutoridad Unican; Duarte Campderros, JorgeAutoridad Unican; Fernández García, MarcosAutoridad Unican; Fernández Madrazo, CeliaAutoridad Unican; Fernández Manteca, Pedro JoséAutoridad Unican; García Alonso, Andrea; Gómez Gramuglio, GervasioAutoridad Unican; Martínez Rivero, Celso; Martínez Ruiz del Árbol, PabloAutoridad Unican; Matorras Weinig, FranciscoAutoridad Unican; Matorras Cuevas, PabloAutoridad Unican; Piedra Gómez, JonatanAutoridad Unican; Prieëls, Cedric; Rodrigo Anoro, TeresaAutoridad Unican; Ruiz Jimeno, AlbertoAutoridad Unican; Scodellaro, LucaAutoridad Unican; [et al.]
Fecha
2021-12-13
Derechos
Attribution 4.0 International. Copyright CERN, for the benefit of the CMS Collaboration.
Publicado en
Journal of High Energy Physics, Vol. 2021, Num.12, Art. Num. 83
Editorial
Springer Verlag
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Palabras clave
Hadron-Hadron scattering (experiments)
Top physics
Resumen/Abstract
ABSTRACT: A search for new top quark interactions is performed within the framework of an effective field theory using the associated production of either one or two top quarks with a Z boson in multilepton final states. The data sample corresponds to an integrated luminosity of 138 fb-¹ of proton-proton collisions at √s = 13 TeV collected by the CMS experiment at the LHC. Five dimension-six operators modifying the electroweak interactions of the top quark are considered. Novel machine-learning techniques are used to enhance the sensitivity to effects arising from these operators. Distributions used for the signal extraction are parameterized in terms of Wilson coefficients describing the interaction strengths of the operators. All five Wilson coefficients are simultaneously fit to data and 95% confidence level intervals are computed. All results are consistent with the SM expectations.
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Attribution 4.0 International. Copyright CERN, for the benefit of the CMS Collaboration.Excepto si se señala otra cosa, la licencia del ítem se describe como Attribution 4.0 International. Copyright CERN, for the benefit of the CMS Collaboration.