Publicação
Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons in proton-proton collisions at √s=13 TeV with the ATLAS detector
| Resumo: | A search for the resonant production of a heavy scalar \( X \) decaying into a Higgs boson and a new lighter scalar \( S \), through the process \( X \rightarrow S(\rightarrow b \bar{b})H(\rightarrow \gamma\gamma) \), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using an integrated luminosity of 140 fb\(^{-1}\) of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The search is performed over the mass range \( 170 \le m_X \le 1000 \) GeV and \( 15 \le m_S \le 500 \) GeV. Parameterised neural networks are used to enhance the signal purity and to achieve continuous sensitivity in a domain of the \( (m_X, m_S) \) plane. No significant excess above the expected background is found and 95\% CL upper limits are set on the cross section times branching ratio, ranging from 39 fb to 0.09 fb. The largest deviation from the background-only expectation occurs for \( (m_X, m_S) = (575, 200) \) GeV with a local (global) significance of 3.5 (2.0) standard deviations. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Hadron-Hadron Scattering Beyond Standard Model Higgs Physics Hadron-Hadron scattering |
| 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 the resonant production of a heavy scalar \( X \) decaying into a Higgs boson and a new lighter scalar \( S \), through the process \( X \rightarrow S(\rightarrow b \bar{b})H(\rightarrow \gamma\gamma) \), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using an integrated luminosity of 140 fb\(^{-1}\) of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The search is performed over the mass range \( 170 \le m_X \le 1000 \) GeV and \( 15 \le m_S \le 500 \) GeV. Parameterised neural networks are used to enhance the signal purity and to achieve continuous sensitivity in a domain of the \( (m_X, m_S) \) plane. No significant excess above the expected background is found and 95\% CL upper limits are set on the cross section times branching ratio, ranging from 39 fb to 0.09 fb. The largest deviation from the background-only expectation occurs for \( (m_X, m_S) = (575, 200) \) GeV with a local (global) significance of 3.5 (2.0) standard deviations. |
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