Searching for long-lived dark scalars at the FCC-ee
Abstract This paper investigates the search for long-lived dark scalars from exotic Higgs boson decays at the Future Circular Collider in its e + e − stage, FCC-ee, considering an integrated luminosity of 10.8 ab−1 collected during the ZH run at a center-of-mass energy s $$ \sqrt{s} $$ = 240 GeV. Th...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-06-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP06(2025)143 |
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| author | G. Ripellino M. Vande Voorde A. Gallén R. Gonzalez Suarez |
| author_facet | G. Ripellino M. Vande Voorde A. Gallén R. Gonzalez Suarez |
| author_sort | G. Ripellino |
| collection | DOAJ |
| description | Abstract This paper investigates the search for long-lived dark scalars from exotic Higgs boson decays at the Future Circular Collider in its e + e − stage, FCC-ee, considering an integrated luminosity of 10.8 ab−1 collected during the ZH run at a center-of-mass energy s $$ \sqrt{s} $$ = 240 GeV. The work considers Zh events where the Z boson decays leptonically and the Higgs boson h decays into two long-lived dark scalars s which further decay into bottom anti-bottom quark pairs. The analysis is performed using a parametrized simulation of the IDEA detector concept and targets dark scalar decays in the tracking volume, resulting in multiple displaced vertices in the final state. The sensitivity towards long-lived dark scalars at FCC-ee is estimated using an event selection requiring two opposite-charge, same-flavor leptons compatible with the Z boson, and at least two displaced vertices in the final state. The selection is seen to efficiently remove the Standard Model background, while retaining sensitivity for dark scalar masses between m s = 20 GeV and m s = 60 GeV and mean proper lifetimes cτ between approximately 10 mm and 10 m. The results show that the search strategy has potential to probe Higgs to dark scalar branching ratios as low as 10−4 for a mean proper lifetime cτ ≈ 1 m. The results provide the first sensitivity estimate for exotic Higgs decays at FCC-ee with the IDEA detector concept, using the common FCC framework. |
| format | Article |
| id | doaj-art-3ecaf5d196a44e0ab06283ae24c8ffab |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-3ecaf5d196a44e0ab06283ae24c8ffab2025-08-20T03:45:39ZengSpringerOpenJournal of High Energy Physics1029-84792025-06-012025611410.1007/JHEP06(2025)143Searching for long-lived dark scalars at the FCC-eeG. Ripellino0M. Vande Voorde1A. Gallén2R. Gonzalez Suarez3Department of Physics and Astronomy, Uppsala UniversityDepartment of Physics, KTH Royal Institute of TechnologyDepartment of Physics and Astronomy, Uppsala UniversityDepartment of Physics and Astronomy, Uppsala UniversityAbstract This paper investigates the search for long-lived dark scalars from exotic Higgs boson decays at the Future Circular Collider in its e + e − stage, FCC-ee, considering an integrated luminosity of 10.8 ab−1 collected during the ZH run at a center-of-mass energy s $$ \sqrt{s} $$ = 240 GeV. The work considers Zh events where the Z boson decays leptonically and the Higgs boson h decays into two long-lived dark scalars s which further decay into bottom anti-bottom quark pairs. The analysis is performed using a parametrized simulation of the IDEA detector concept and targets dark scalar decays in the tracking volume, resulting in multiple displaced vertices in the final state. The sensitivity towards long-lived dark scalars at FCC-ee is estimated using an event selection requiring two opposite-charge, same-flavor leptons compatible with the Z boson, and at least two displaced vertices in the final state. The selection is seen to efficiently remove the Standard Model background, while retaining sensitivity for dark scalar masses between m s = 20 GeV and m s = 60 GeV and mean proper lifetimes cτ between approximately 10 mm and 10 m. The results show that the search strategy has potential to probe Higgs to dark scalar branching ratios as low as 10−4 for a mean proper lifetime cτ ≈ 1 m. The results provide the first sensitivity estimate for exotic Higgs decays at FCC-ee with the IDEA detector concept, using the common FCC framework.https://doi.org/10.1007/JHEP06(2025)143Beyond Standard Modele +-e − ExperimentsDark MatterExotics |
| spellingShingle | G. Ripellino M. Vande Voorde A. Gallén R. Gonzalez Suarez Searching for long-lived dark scalars at the FCC-ee Journal of High Energy Physics Beyond Standard Model e +-e − Experiments Dark Matter Exotics |
| title | Searching for long-lived dark scalars at the FCC-ee |
| title_full | Searching for long-lived dark scalars at the FCC-ee |
| title_fullStr | Searching for long-lived dark scalars at the FCC-ee |
| title_full_unstemmed | Searching for long-lived dark scalars at the FCC-ee |
| title_short | Searching for long-lived dark scalars at the FCC-ee |
| title_sort | searching for long lived dark scalars at the fcc ee |
| topic | Beyond Standard Model e +-e − Experiments Dark Matter Exotics |
| url | https://doi.org/10.1007/JHEP06(2025)143 |
| work_keys_str_mv | AT gripellino searchingforlongliveddarkscalarsatthefccee AT mvandevoorde searchingforlongliveddarkscalarsatthefccee AT agallen searchingforlongliveddarkscalarsatthefccee AT rgonzalezsuarez searchingforlongliveddarkscalarsatthefccee |