Search for top squarks in the four-body decay mode with single lepton final states in proton-proton collisions at √s = 13 TeV

A search for the pair production of the lightest supersymmetric partner of the top quark, the top squark (˜t₁), is presented. The search targets the four-body decay of the ˜t₁, which is preferred when the mass difference between the top squark and the lightest supersymmetric particle is smaller than...

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Detalles Bibliográficos
Autores: Tumasyan, A., Brochero Cifuentes, Javier Andrés|||0000-0003-2093-7856, Cabrillo Bartolomé, José Iban, Calderón Tazón, Alicia|||0000-0002-7205-2040, Duarte Campderros, Jorge|||0000-0003-0687-5214, Fernández García, Marcos|||0000-0002-4824-1087, Fernández Madrazo, Celia|||0000-0001-9748-4336, García Alonso, Andrea, Gómez Gramuglio, Gervasio|||0000-0002-1077-6553, Lasaosa García, Clara, Martínez Rivero, Celso, Martínez Ruiz del Árbol, Pablo|||0000-0002-7737-5121, Matorras Weinig, Francisco|||0000-0003-4295-5668, Matorras Cuevas, Pablo|||0000-0001-7481-7273, Piedra Gómez, Jonatan|||0000-0002-9157-1700, Prieëls, Cedric, Ruiz Jimeno, Alberto|||0000-0002-3639-0368, Scodellaro, Luca|||0000-0002-4974-8330, Vila Álvarez, Iván |||0000-0002-6797-7209, Vizán García, Jesús Manuel|||0000-0002-6823-8854
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/31969
Acceso en línea:https://hdl.handle.net/10902/31969
Access Level:acceso abierto
Palabra clave:Hadron-Hadron Scattering
Supersymmetry
Top Squark
Descripción
Sumario:A search for the pair production of the lightest supersymmetric partner of the top quark, the top squark (˜t₁), is presented. The search targets the four-body decay of the ˜t₁, which is preferred when the mass difference between the top squark and the lightest supersymmetric particle is smaller than the mass of the W boson. This decay mode consists of a bottom quark, two other fermions, and the lightest neutralino ( ˜X⁰₁ ), which is assumed to be the lightest supersymmetric particle. The data correspond to an integrated luminosity of 138 fb−¹ of proton-proton collisions at a center-of-mass energy of 13TeV collected by the CMS experiment at the CERN LHC. Events are selected using the presence of a high-momentum jet, an electron or muon with low transverse momentum, and a significant missing transverse momentum. The signal is selected based on a multivariate approach that is optimized for the difference between m(˜t₁) and m(˜X⁰₁). The contribution from leading background processes is estimated from data. No significant excess is observed above the expectation from standard model processes. The results of this search exclude top squarks at 95% confidence level for masses up to 480 and 700 GeV for m(˜t₁)−m(˜X⁰₁) = 10 and 80 GeV, respectively.

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