Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP
Abstract In hidden-sector models, axion-like particles (ALPs) can couple to heavy neutral leptons (HNLs), leading to rich phenomenologies. We study ALPs produced from D- and B-meson decays via quark-flavor-violating couplings, and decaying exclusively into a pair of HNLs which mix with active neutri...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-01-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP01(2025)070 |
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| author | Zeren Simon Wang Yu Zhang Wei Liu |
| author_facet | Zeren Simon Wang Yu Zhang Wei Liu |
| author_sort | Zeren Simon Wang |
| collection | DOAJ |
| description | Abstract In hidden-sector models, axion-like particles (ALPs) can couple to heavy neutral leptons (HNLs), leading to rich phenomenologies. We study ALPs produced from D- and B-meson decays via quark-flavor-violating couplings, and decaying exclusively into a pair of HNLs which mix with active neutrinos. The ALP can be either short- or long-lived, depending on the masses of the ALP and the HNL, as well as the corresponding coupling strength. Such GeV-scale HNLs are necessarily long-lived given the current bounds on their mixing parameters. We assess the sensitivities of the LHC far detectors and SHiP, to the long-lived HNLs in such theoretical scenarios. We find that for currently allowed values of the ALP couplings, most of these experiments can probe the active-sterile-neutrino mixing parameters multiple orders of magnitude beyond the present bounds, covering large parameter region targeted with the type-I seesaw mechanism. In addition, our results show that compared to the case of a promptly decaying ALP, assuming an ALP of longer lifetimes weakens the sensitivities of the considered experiments to the long-lived HNLs. |
| format | Article |
| id | doaj-art-5a07c93869cb41c69420a8fcab09d528 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-5a07c93869cb41c69420a8fcab09d5282025-01-19T12:07:03ZengSpringerOpenJournal of High Energy Physics1029-84792025-01-012025112610.1007/JHEP01(2025)070Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiPZeren Simon Wang0Yu Zhang1Wei Liu2School of Physics, Hefei University of TechnologySchool of Physics, Hefei University of TechnologyDepartment of Applied Physics and MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and TechnologyAbstract In hidden-sector models, axion-like particles (ALPs) can couple to heavy neutral leptons (HNLs), leading to rich phenomenologies. We study ALPs produced from D- and B-meson decays via quark-flavor-violating couplings, and decaying exclusively into a pair of HNLs which mix with active neutrinos. The ALP can be either short- or long-lived, depending on the masses of the ALP and the HNL, as well as the corresponding coupling strength. Such GeV-scale HNLs are necessarily long-lived given the current bounds on their mixing parameters. We assess the sensitivities of the LHC far detectors and SHiP, to the long-lived HNLs in such theoretical scenarios. We find that for currently allowed values of the ALP couplings, most of these experiments can probe the active-sterile-neutrino mixing parameters multiple orders of magnitude beyond the present bounds, covering large parameter region targeted with the type-I seesaw mechanism. In addition, our results show that compared to the case of a promptly decaying ALP, assuming an ALP of longer lifetimes weakens the sensitivities of the considered experiments to the long-lived HNLs.https://doi.org/10.1007/JHEP01(2025)070Axions and ALPsSterile or Heavy Neutrinos |
| spellingShingle | Zeren Simon Wang Yu Zhang Wei Liu Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP Journal of High Energy Physics Axions and ALPs Sterile or Heavy Neutrinos |
| title | Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP |
| title_full | Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP |
| title_fullStr | Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP |
| title_full_unstemmed | Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP |
| title_short | Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP |
| title_sort | searching for heavy neutral leptons coupled to axion like particles at the lhc far detectors and ship |
| topic | Axions and ALPs Sterile or Heavy Neutrinos |
| url | https://doi.org/10.1007/JHEP01(2025)070 |
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