Publicação
Combination of Searches for Higgs Boson Pair Production in pp Collisions at √s=13 TeV with the ATLAS Detector
| Resumo: | This Letter presents results from a combination of searches for Higgs boson pair production using \( 126\text{–}140\,\,\text{fb}^{-1} \) of proton-proton collision data at \( \sqrt{s} = 13\,\,\text{TeV} \) recorded with the ATLAS detector. At 95% confidence level (CL), the upper limit on the production rate is 2.9 times the standard model (SM) prediction, with an expected limit of 2.4 assuming no Higgs boson pair production. Constraints on the Higgs boson self-coupling modifier \( \kappa_{\lambda} = \lambda_{HHH}/\lambda_{SM}^{HHH} \), and the quartic \( HHVV \) coupling modifier \( \kappa_{2V} = g_{HHVV}/g_{SM}^{HHVV} \), are derived individually, fixing the other parameter to its SM value. The observed 95% CL intervals are \( -1.2 < \kappa_{\lambda} < 7.2 \) and \( 0.6 < \kappa_{2V} < 1.5 \), respectively, while the expected intervals are \( -1.6 < \kappa_{\lambda} < 7.2 \) and \( 0.4 < \kappa_{2V} < 1.6 \) in the SM case. Constraints obtained for several interaction parameters within Higgs effective field theory are the strongest to date, offering insights into potential deviations from SM predictions. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | 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: | This Letter presents results from a combination of searches for Higgs boson pair production using \( 126\text{–}140\,\,\text{fb}^{-1} \) of proton-proton collision data at \( \sqrt{s} = 13\,\,\text{TeV} \) recorded with the ATLAS detector. At 95% confidence level (CL), the upper limit on the production rate is 2.9 times the standard model (SM) prediction, with an expected limit of 2.4 assuming no Higgs boson pair production. Constraints on the Higgs boson self-coupling modifier \( \kappa_{\lambda} = \lambda_{HHH}/\lambda_{SM}^{HHH} \), and the quartic \( HHVV \) coupling modifier \( \kappa_{2V} = g_{HHVV}/g_{SM}^{HHVV} \), are derived individually, fixing the other parameter to its SM value. The observed 95% CL intervals are \( -1.2 < \kappa_{\lambda} < 7.2 \) and \( 0.6 < \kappa_{2V} < 1.5 \), respectively, while the expected intervals are \( -1.6 < \kappa_{\lambda} < 7.2 \) and \( 0.4 < \kappa_{2V} < 1.6 \) in the SM case. Constraints obtained for several interaction parameters within Higgs effective field theory are the strongest to date, offering insights into potential deviations from SM predictions. |
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