Publicação
Studies of new Higgs boson interactions through nonresonant HH production in the b(b)over-barγγ final state in pp collisions at √s=13 TeV with the ATLAS detector
| Resumo: | A search for nonresonant Higgs boson pair production in the \( b \overline{b} \gamma \gamma \) final state is performed using \( 140 \, \text{fb}^{-1} \) of proton-proton collisions at a centre-of-mass energy of \( 13 \, \text{TeV} \) recorded by the ATLAS detector at the CERN Large Hadron Collider. This analysis supersedes and expands upon the previous nonresonant ATLAS results in this final state based on the same data sample. The analysis strategy is optimised to probe anomalous values not only of the Higgs (H) boson self-coupling modifier \( \kappa_{\lambda} \) but also of the quartic HHV V (V = W, Z) coupling modifier \( \kappa_{2V} \). No significant excess above the expected background from Standard Model processes is observed. An observed upper limit \( \mu_{HH} < 4.0 \) is set at 95% confidence level on the Higgs boson pair production cross-section normalised to its Standard Model prediction. The 95% confidence intervals for the coupling modifiers are \( -1.4 < \kappa_{\lambda} < 6.9 \) and \( -0.5 < \kappa_{2V} < 2.7 \), assuming all other Higgs boson couplings except the one under study are fixed to the Standard Model predictions. The results are interpreted in the Standard Model effective field theory and Higgs effective field theory frameworks in terms of constraints on the couplings of anomalous Higgs boson (self-)interactions. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Hadron-Hadron Scattering Higgs Physics |
| 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 nonresonant Higgs boson pair production in the \( b \overline{b} \gamma \gamma \) final state is performed using \( 140 \, \text{fb}^{-1} \) of proton-proton collisions at a centre-of-mass energy of \( 13 \, \text{TeV} \) recorded by the ATLAS detector at the CERN Large Hadron Collider. This analysis supersedes and expands upon the previous nonresonant ATLAS results in this final state based on the same data sample. The analysis strategy is optimised to probe anomalous values not only of the Higgs (H) boson self-coupling modifier \( \kappa_{\lambda} \) but also of the quartic HHV V (V = W, Z) coupling modifier \( \kappa_{2V} \). No significant excess above the expected background from Standard Model processes is observed. An observed upper limit \( \mu_{HH} < 4.0 \) is set at 95% confidence level on the Higgs boson pair production cross-section normalised to its Standard Model prediction. The 95% confidence intervals for the coupling modifiers are \( -1.4 < \kappa_{\lambda} < 6.9 \) and \( -0.5 < \kappa_{2V} < 2.7 \), assuming all other Higgs boson couplings except the one under study are fixed to the Standard Model predictions. The results are interpreted in the Standard Model effective field theory and Higgs effective field theory frameworks in terms of constraints on the couplings of anomalous Higgs boson (self-)interactions. |
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