Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/69329
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(es): | Onofre, A. Castro, Nuno Filipe ATLAS Collaboration |
Data: | 2020 |
Editora: | Springer |
Revista: | European Physical Journal C |
Citação: | Aad, G., Abbott, B., Abbott, D. C., Abud, A. A., Abeling, K., Abhayasinghe, D. K., . . . Zwalinski, L. (2020). 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. [Article]. European Physical Journal C, 80(8). doi: 10.1140/epjc/s10052-020-8102-8 |
Resumo(s): | 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~01, with t(∗) denoting an on-shell (off-shell) top quark and χ~01 the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where mt~>mt+mχ~01, top squark masses are excluded in the range 400–1250 GeV for χ~01 masses below 200 GeV at 95% confidence level. In the situation where mt~∼mt+mχ~01, top squark masses in the range 300–630 GeV are excluded, while in the case where mt~<mW+mb+mχ~01 (with mt~−mχ~01≥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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/69329 |
DOI: | 10.1140/epjc/s10052-020-8102-8 |
ISSN: | 1434-6044 |
e-ISSN: | 1434-6052 |
Versão da editora: | https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-020-8102-8 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | LIP - Artigos/papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Aad2020_Article_SearchForAScalarPartnerOfTheTo.pdf | 3,82 MB | Adobe PDF | Ver/Abrir |