Publicação
Search for decays of the Higgs boson into scalar particles decaying into four or six b quarks using pp collisions at (Formula presented) = 13 TeV with the ATLAS detector
| Resumo: | A search for exotic decays of the Higgs boson \( H \) into new scalar or pseudoscalar particles that subsequently decay into \( b \)-quarks is presented. The search considers \( Z H \) production with several decay scenarios for the Higgs boson; first to a pair of identical scalars, \( H \rightarrow 2a \rightarrow 4b \), second to a pair of scalars with different masses (\( m_{a1} < m_{a2} \)), either directly, \( H \rightarrow a_1 a_2 \rightarrow 4b \), or via a longer decay chain, \( H \rightarrow a_1 a_2 \rightarrow 3a_1 \rightarrow 6b \). The analysis uses proton-proton collision data at \( \sqrt{s} = 13 \text{ TeV} \) collected with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of \( 140 \text{ fb}^{-1} \). No significant excess above the Standard Model prediction is observed. The search sets upper limits at 95% confidence level on the ratio of the Higgs boson production cross section to the SM prediction times the branching ratio of Higgs bosons decaying into \( 4b \) or \( 6b \), between 4% and 25% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow 2a \rightarrow 4b) \), between 24% and 38% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow a_1 a_2 \rightarrow 4b) \), and between 10% and 20% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow a_1 a_2 \rightarrow 3a_1 \rightarrow 6b) \), depending on the masses of the scalar particles. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Ciências Naturais::Ciências Físicas |
| Ano: | 2025 |
| 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 exotic decays of the Higgs boson \( H \) into new scalar or pseudoscalar particles that subsequently decay into \( b \)-quarks is presented. The search considers \( Z H \) production with several decay scenarios for the Higgs boson; first to a pair of identical scalars, \( H \rightarrow 2a \rightarrow 4b \), second to a pair of scalars with different masses (\( m_{a1} < m_{a2} \)), either directly, \( H \rightarrow a_1 a_2 \rightarrow 4b \), or via a longer decay chain, \( H \rightarrow a_1 a_2 \rightarrow 3a_1 \rightarrow 6b \). The analysis uses proton-proton collision data at \( \sqrt{s} = 13 \text{ TeV} \) collected with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of \( 140 \text{ fb}^{-1} \). No significant excess above the Standard Model prediction is observed. The search sets upper limits at 95% confidence level on the ratio of the Higgs boson production cross section to the SM prediction times the branching ratio of Higgs bosons decaying into \( 4b \) or \( 6b \), between 4% and 25% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow 2a \rightarrow 4b) \), between 24% and 38% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow a_1 a_2 \rightarrow 4b) \), and between 10% and 20% for \( \sigma(ZH)/\sigma_{SM}(ZH) \times \mathcal{B}(H \rightarrow a_1 a_2 \rightarrow 3a_1 \rightarrow 6b) \), depending on the masses of the scalar particles. |
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