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Título: | 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 |
Autor: | ATLAS Collaboration; Aparisi Pozo, J.A.; Bailey, A.J.; Cabrera, Susana CSIC ORCID; Castillo, F.L.; Castillo Mª Victoria; Costa, M. J.; Escobar, Carlos CSIC ORCID ; Estrada, Oscar; Ferrer, Antonio CSIC ORCID; Fiorini, L. CSIC ORCID; Fullana, Esteban CSIC ORCID; Fuster, Juan CSIC ORCID; García García, Carmen CSIC ORCID; García Navarro, José Enrique CSIC ORCID; González de la Hoz, Santiago CSIC ORCID CVN; Gonzalvo Rodríguez, Galo Rafael; Guerrero Rojas, J.G.R.; Higón, Emilio CSIC ORCID; Lacasta Llácer, Carlos CSIC ORCID ; Lozano Bahilo, José J.; Madaffari, Daniele CSIC ORCID; Mamuzic, Judita; Martí García, Salvador; Martinez Agullo, Pablo; Mitsou, Vasiliki A. CSIC ORCID ; Moreno Llácer, María CSIC ORCID; Poveda, Joaquín CSIC ORCID; Rodriguez Bosca, S.; Ruiz-Martinez, A.; Salt, José CSIC ORCID; Santra, A.; Sayago Galvan, Ivan; Soldevila, Urmila CSIC ORCID; Sánchez Martínez, Javier CSIC ORCID; Valero, Alberto CSIC ORCID; Valls Ferrer, Juan Antonio CSIC ORCID; Vos, Marcel CSIC ORCID | Fecha de publicación: | ago-2020 | Editor: | Springer Nature | Citación: | European Physical Journal C 80: 737 (2020) | Resumen: | 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 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. | Versión del editor: | http://dx.doi.org/10.1140/epjc/s10052-020-8102-8 | URI: | http://hdl.handle.net/10261/230432 | DOI: | 10.1140/epjc/s10052-020-8102-8 | Identificadores: | doi: 10.1140/epjc/s10052-020-8102-8 issn: 1434-6052 |
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136_Atlas_Search.pdf | 2,57 MB | Adobe PDF | Visualizar/Abrir |
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