Discovering heavy neutrino-antineutrino oscillations at the Z-pole
Abstract Collider-testable type I seesaw extensions of the Standard Model are generally protected by an approximate lepton number (LN) symmetry. Consequently, they predict pseudo-Dirac heavy neutral leptons (HNLs) composed of two nearly degenerate Majorana fields. The interference between the two ma...
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2024-11-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP11(2024)102 |
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| author | Stefan Antusch Jan Hajer Bruno M. S. Oliveira |
| author_facet | Stefan Antusch Jan Hajer Bruno M. S. Oliveira |
| author_sort | Stefan Antusch |
| collection | DOAJ |
| description | Abstract Collider-testable type I seesaw extensions of the Standard Model are generally protected by an approximate lepton number (LN) symmetry. Consequently, they predict pseudo-Dirac heavy neutral leptons (HNLs) composed of two nearly degenerate Majorana fields. The interference between the two mass eigenstates can induce heavy neutrino-antineutrino oscillations ( N N ¯ Os $$ N\overline{N}\textrm{Os} $$ ) leading to observable lepton number violation (LNV), even though the LN symmetry is approximately conserved. These N N ¯ Os $$ N\overline{N}\textrm{Os} $$ could be resolved in long-lived HNL searches at collider experiments, such as the proposed Future Circular e + e − Collider (FCC-ee) or Circular Electron Positron Collider (CEPC). However, during their Z-pole runs, the LN carried away by the light (anti)neutrinos produced alongside the HNLs prevents LNV from being observed directly. Nevertheless, N N ¯ Os $$ N\overline{N}\textrm{Os} $$ materialise as oscillating signatures in final state distributions. We discuss and compare a selection of such oscillating observables, and perform a Monte Carlo simulation to assess the parameter space in which N N ¯ Os $$ N\overline{N}\textrm{Os} $$ could be resolved. |
| format | Article |
| id | doaj-art-2455736ace984119bd6495d7371cb94c |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | SpringerOpen |
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| series | Journal of High Energy Physics |
| spelling | doaj-art-2455736ace984119bd6495d7371cb94c2024-12-08T12:10:17ZengSpringerOpenJournal of High Energy Physics1029-84792024-11-0120241112810.1007/JHEP11(2024)102Discovering heavy neutrino-antineutrino oscillations at the Z-poleStefan Antusch0Jan Hajer1Bruno M. S. Oliveira2Departement Physik, Universität BaselCentro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico (IST), Universidade de LisboaCentro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico (IST), Universidade de LisboaAbstract Collider-testable type I seesaw extensions of the Standard Model are generally protected by an approximate lepton number (LN) symmetry. Consequently, they predict pseudo-Dirac heavy neutral leptons (HNLs) composed of two nearly degenerate Majorana fields. The interference between the two mass eigenstates can induce heavy neutrino-antineutrino oscillations ( N N ¯ Os $$ N\overline{N}\textrm{Os} $$ ) leading to observable lepton number violation (LNV), even though the LN symmetry is approximately conserved. These N N ¯ Os $$ N\overline{N}\textrm{Os} $$ could be resolved in long-lived HNL searches at collider experiments, such as the proposed Future Circular e + e − Collider (FCC-ee) or Circular Electron Positron Collider (CEPC). However, during their Z-pole runs, the LN carried away by the light (anti)neutrinos produced alongside the HNLs prevents LNV from being observed directly. Nevertheless, N N ¯ Os $$ N\overline{N}\textrm{Os} $$ materialise as oscillating signatures in final state distributions. We discuss and compare a selection of such oscillating observables, and perform a Monte Carlo simulation to assess the parameter space in which N N ¯ Os $$ N\overline{N}\textrm{Os} $$ could be resolved.https://doi.org/10.1007/JHEP11(2024)102Sterile or Heavy NeutrinosNew Light ParticlesSpecific BSM Phenomenology |
| spellingShingle | Stefan Antusch Jan Hajer Bruno M. S. Oliveira Discovering heavy neutrino-antineutrino oscillations at the Z-pole Journal of High Energy Physics Sterile or Heavy Neutrinos New Light Particles Specific BSM Phenomenology |
| title | Discovering heavy neutrino-antineutrino oscillations at the Z-pole |
| title_full | Discovering heavy neutrino-antineutrino oscillations at the Z-pole |
| title_fullStr | Discovering heavy neutrino-antineutrino oscillations at the Z-pole |
| title_full_unstemmed | Discovering heavy neutrino-antineutrino oscillations at the Z-pole |
| title_short | Discovering heavy neutrino-antineutrino oscillations at the Z-pole |
| title_sort | discovering heavy neutrino antineutrino oscillations at the z pole |
| topic | Sterile or Heavy Neutrinos New Light Particles Specific BSM Phenomenology |
| url | https://doi.org/10.1007/JHEP11(2024)102 |
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