Publicação
Search for a CP-odd Higgs boson decaying into a heavy CP-even Higgs boson and a Z boson in the l+l-t(t)over-bar and ν(ν)over-barb(b)over-bar final states using 140 fb-1 of data collected with the ATLAS detector
| Resumo: | A search for a heavy CP-odd Higgs boson, \( A \), decaying into a \( Z \) boson and a heavy CP-even Higgs boson, \( H \), is presented. It uses the full LHC Run 2 dataset of pp collisions at \( \sqrt{s} = 13 \) TeV collected with the ATLAS detector, corresponding to an integrated luminosity of \( 140 \, \text{fb}^{-1} \). The search for \( A \rightarrow ZH \) is performed in the \( \ell^+\ell^-t\bar{t} \) and \( \nu\nu b\bar{b} \) final states and surpasses the reach of previous searches in different final states in the region with \( m_H > 350 \) GeV and \( m_A > 800 \) GeV. No significant deviation from the Standard Model expectation is found. Upper limits are placed on the production cross-section times the decay branching ratios. Limits with less model dependence are also presented as functions of the reconstructed \( m(t\bar{t}) \) and \( m(b\bar{b}) \) distributions in the \( \ell^+\ell^-t\bar{t} \) and \( \nu\nu b\bar{b} \) channels, respectively. In addition, the results are interpreted in the context of two-Higgs-doublet models. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Hadron-Hadron Scattering Ciências Naturais::Ciências Físicas |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | A search for a heavy CP-odd Higgs boson, \( A \), decaying into a \( Z \) boson and a heavy CP-even Higgs boson, \( H \), is presented. It uses the full LHC Run 2 dataset of pp collisions at \( \sqrt{s} = 13 \) TeV collected with the ATLAS detector, corresponding to an integrated luminosity of \( 140 \, \text{fb}^{-1} \). The search for \( A \rightarrow ZH \) is performed in the \( \ell^+\ell^-t\bar{t} \) and \( \nu\nu b\bar{b} \) final states and surpasses the reach of previous searches in different final states in the region with \( m_H > 350 \) GeV and \( m_A > 800 \) GeV. No significant deviation from the Standard Model expectation is found. Upper limits are placed on the production cross-section times the decay branching ratios. Limits with less model dependence are also presented as functions of the reconstructed \( m(t\bar{t}) \) and \( m(b\bar{b}) \) distributions in the \( \ell^+\ell^-t\bar{t} \) and \( \nu\nu b\bar{b} \) channels, respectively. In addition, the results are interpreted in the context of two-Higgs-doublet models. |
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