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Combination of searches for Higgs boson decays into a photon and a massless dark photon using pp collisions at √s <bold>=</bold> 13 TeV with the ATLAS detector
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| Resumo: | A combination of searches for Higgs boson decays into a visible photon and a massless dark photon (\( H \rightarrow \gamma \gamma_d \)) is presented using 139 fb\(^{-1}\) of proton-proton collision data at a centre-of-mass energy of \( \sqrt{s} = 13 \) TeV recorded by the ATLAS detector at the Large Hadron Collider. The observed (expected) 95\% confidence level upper limit on the Standard Model Higgs boson decay branching ratio is determined to be \( B(H \rightarrow \gamma \gamma_d) < 1.3\% \) (1.5)%. The search is also sensitive to higher-mass Higgs bosons decaying into the same final state. The observed (expected) 95\% confidence level limit on the cross-section times branching ratio ranges from 16 fb (20 fb) for \( m_H = 400 \) GeV to 1.0 fb (1.5 fb) for \( m_H = 3 \) TeV. Results are also interpreted in the context of a minimal simplified model. |
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| Autores principais: | Castro, Nuno Filipe |
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| Outros Autores: | Onofre, A.; ATLAS Collaboration |
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| Assunto: | Hadron-Hadron Scattering Higgs Physics |
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| Ano: | 2024 |
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| País: | Portugal |
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| Tipo de documento: | artigo |
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| Tipo de acesso: | acesso aberto |
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| Instituição associada: | Universidade do Minho |
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| Idioma: | inglês |
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| Origem: | RepositóriUM - Universidade do Minho |
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