Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/87782
Título: | Search for an invisible scalar in tt¯ final states at the LHC |
Autor(es): | Azevedo, Duarte Capucha, Rodrigo Chaves, Pedro Martins, João Bravo Onofre, A. Santos, Rui |
Palavras-chave: | Dark Matter at Colliders New Light Particles |
Data: | 2023 |
Revista: | Journal of High Energy Physics |
Citação: | Azevedo, D., Capucha, R., Chaves, P., Martins, J. B., Onofre, A., & Santos, R. (2023). Search for an invisible scalar in tt¯ final states at the LHC. [Article]. Journal of High Energy Physics, 2023(11). doi: 10.1007/jhep11(2023)125 |
Resumo(s): | We use the current tt¯ experimental analysis to look for Dark Matter (DM) particles hidden in the final state. We present a phenomenological study where we successfully perform the reconstruction of a tt¯ system in the presence of a scalar mediator Y 0, that couples to both Standard Model (SM) and to DM particles. We use a MadGraph5_aMC@NLO simplified DM model, where signal samples of pp → tt¯ Y 0 are generated at the Large Hadron Collider (LHC) with both Charge-Parity (CP) -even and CP-odd couplings of Y 0 to the top quarks. Different mass scales for the Y 0 mediator are considered, from the low mass region (~ 0 GeV) to masses close to the Higgs boson mass (125 GeV). The dileptonic final states of the tt¯ system were used in our analysis. The reconstruction of the tt¯ system is done with a kinematic fit, without reconstructing the mediator. All relevant SM backgrounds for the dileptonic tt¯ search at the LHC are considered. Furthermore, CP angular observables were used to probe the CP-nature of the coupling between the mediator and top-quarks, which allowed to set confidence level (CL) limits for those Yukawa couplings as a function of the mediator mass. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/87782 |
DOI: | 10.1007/jhep11(2023)125 |
ISSN: | 1126-6708 |
e-ISSN: | 1029-8479 |
Versão da editora: | https://link.springer.com/article/10.1007/JHEP11(2023)125 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | LIP - Artigos/papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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JHEP11(2023)125.pdf | 1,76 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons