Search for a scalar partner of the top quark in the all-hadronic tt¯ plus missing transverse momentum final state at √s = 13 TeV with the ATLAS detector
Entidad
UAM. Departamento de Física TeóricaEditor
SpringerFecha de edición
2020-08-13Cita
10.1140/epjc/s10052-020-8102-8
European Physical Journal C 80.8 (2020): 737
ISSN
1434-6044 (print); 1434-6052 (online)DOI
10.1140/epjc/s10052-020-8102-8Versión del editor
https://doi.org/10.1140/epjc/s10052-020-8102-8Materias
Boson; Partons; Higgs Bosons; FísicaNota
Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMDerechos
© CERN for the benefit of the ATLAS collaboration 2020Resumen
A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic tt¯ plus missing transverse momentum final state is presented. The analysis of 139 fb - 1 of √s = 13 TeV proton–proton collision data collected using the ATLAS detector at the LHC yields no significant excess over the Standard Model background expectation. To interpret the results, a supersymmetric model is used where the top squark decays via t~→t(∗)χ~10, with t(∗) denoting an on-shell (off-shell) top quark and χ~10 the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where mt~> mt + mχ~10, top squark masses are excluded in the range 400–1250 GeV for χ~10 masses below 200 GeV at 95% confidence level. In the situation where mt~∼mt+mχ~10, top squark masses in the range 300–630 GeV are excluded, while in the case where mt~ < mW + mb + mχ~10 (with mt~-mχ~10 ≥ 5 GeV), considered for the first time in an ATLAS all-hadronic search, top squark masses in the range 300–660 GeV are excluded. Limits are also set for scalar third-generation up-type leptoquarks, excluding leptoquarks with masses below 1240 GeV when considering only leptoquark decays into a top quark and a neutrino
Lista de ficheros
Google Scholar:Aad, G.
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ATLAS Collaboration
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Álvarez Estévez, Manuel
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Barreiro Alonso, Fernando
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Calvente López, Sergio
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Camarero Muñoz, Daniel
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Peso Malagón, José del
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Glasman Kuguel, Claudia Beatriz
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Terrón Cuadrado, Juan
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