Searching for type I seesaw mechanism in a two heavy neutral leptons scenario at FCC-ee
Abstract This paper investigates the search for heavy neutral leptons (HNL) in the type I seesaw mechanism at the Future Circular Collider in its e + e − stage (FCC-ee), considering a luminosity of 125 ab −1 collected at s $$ \sqrt{s} $$ = 91.2 GeV. The study examines two generations of heavy neutra...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-05-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP05(2025)054 |
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| author | S. Ajmal P. Azzi S. Giappichini M. Klute O. Panella M. Presilla X. Zuo |
| author_facet | S. Ajmal P. Azzi S. Giappichini M. Klute O. Panella M. Presilla X. Zuo |
| author_sort | S. Ajmal |
| collection | DOAJ |
| description | Abstract This paper investigates the search for heavy neutral leptons (HNL) in the type I seesaw mechanism at the Future Circular Collider in its e + e − stage (FCC-ee), considering a luminosity of 125 ab −1 collected at s $$ \sqrt{s} $$ = 91.2 GeV. The study examines two generations of heavy neutral leptons produced in association with Standard Model (SM) neutrinos and decaying to a purely leptonic final state. This theoretical framework can explain neutrino oscillations and other open questions of the SM, providing a broader perspective on the relevance of this experimental search. The analysis is performed using a fast simulation of the IDEA detector concept to study potential HNL interactions at the FCC-ee. The sensitivity contours are obtained from a selection of kinematic variables aimed at improving the signal-to-background ratio for the prompt production case. In the case of long-lived HNLs, the background can be almost fully eliminated by exploiting their displaced decay vertices. The study shows that the FCC-ee has a significant sensitivity to observing these objects in a region of the phase space not accessible by other experiments. |
| format | Article |
| id | doaj-art-95ee4f886ee14096b9fb8a2aaf4e0a8d |
| institution | DOAJ |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-95ee4f886ee14096b9fb8a2aaf4e0a8d2025-08-20T03:10:27ZengSpringerOpenJournal of High Energy Physics1029-84792025-05-012025511310.1007/JHEP05(2025)054Searching for type I seesaw mechanism in a two heavy neutral leptons scenario at FCC-eeS. Ajmal0P. Azzi1S. Giappichini2M. Klute3O. Panella4M. Presilla5X. Zuo6INFN Sezione di PerugiaINFN Sezione di PadovaInstitute for Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)Institute for Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)INFN Sezione di PerugiaInstitute for Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)Institute for Experimental Particle Physics (ETP), Karlsruhe Institute of Technology (KIT)Abstract This paper investigates the search for heavy neutral leptons (HNL) in the type I seesaw mechanism at the Future Circular Collider in its e + e − stage (FCC-ee), considering a luminosity of 125 ab −1 collected at s $$ \sqrt{s} $$ = 91.2 GeV. The study examines two generations of heavy neutral leptons produced in association with Standard Model (SM) neutrinos and decaying to a purely leptonic final state. This theoretical framework can explain neutrino oscillations and other open questions of the SM, providing a broader perspective on the relevance of this experimental search. The analysis is performed using a fast simulation of the IDEA detector concept to study potential HNL interactions at the FCC-ee. The sensitivity contours are obtained from a selection of kinematic variables aimed at improving the signal-to-background ratio for the prompt production case. In the case of long-lived HNLs, the background can be almost fully eliminated by exploiting their displaced decay vertices. The study shows that the FCC-ee has a significant sensitivity to observing these objects in a region of the phase space not accessible by other experiments.https://doi.org/10.1007/JHEP05(2025)054Sterile or Heavy NeutrinosNeutrino MixingBaryon/Lepton Number Violation |
| spellingShingle | S. Ajmal P. Azzi S. Giappichini M. Klute O. Panella M. Presilla X. Zuo Searching for type I seesaw mechanism in a two heavy neutral leptons scenario at FCC-ee Journal of High Energy Physics Sterile or Heavy Neutrinos Neutrino Mixing Baryon/Lepton Number Violation |
| title | Searching for type I seesaw mechanism in a two heavy neutral leptons scenario at FCC-ee |
| title_full | Searching for type I seesaw mechanism in a two heavy neutral leptons scenario at FCC-ee |
| title_fullStr | Searching for type I seesaw mechanism in a two heavy neutral leptons scenario at FCC-ee |
| title_full_unstemmed | Searching for type I seesaw mechanism in a two heavy neutral leptons scenario at FCC-ee |
| title_short | Searching for type I seesaw mechanism in a two heavy neutral leptons scenario at FCC-ee |
| title_sort | searching for type i seesaw mechanism in a two heavy neutral leptons scenario at fcc ee |
| topic | Sterile or Heavy Neutrinos Neutrino Mixing Baryon/Lepton Number Violation |
| url | https://doi.org/10.1007/JHEP05(2025)054 |
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