Abstract
In this paper, we study the potential of future colliders to explore the parameter space of heavy neutral leptons (HNLs) through the dipole portal. We consider hadron colliders such as the LHC in the high luminosity phase and FCC-hh, and lepton colliders, such as FCC-ee. We consider various signatures for the HNLs, including the missing energy signature and displaced decays, and discuss the complementarity between the hadron and lepton colliders. We propose new selection rules which may significantly reduce the background events in FCC-ee. In particular, we find that thanks to a much clearer environment, FCC-ee may search for the HNLs with masses up to ≃ 30 GeV and proper lifetimes cτN ≳ 1 cm, which is well beyond the reach of the experiments to be launched in the next decade.
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Acknowledgments
We thank Juliette Alimena, Suchita Kulkarni, and Rebeca Gonzalez Suarez for discussing the background estimates at FCC-ee performed in [52], and Lesya Shchutska for discussing the backgrounds at the LHC. This project has received support from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 860881-HIDDeN. Jing-yu Zhu is grateful for the support from the China and Germany Postdoctoral Exchange Program from the Office of China Postdoctoral Council and the Helmholtz Centre under Grant No. 2020031 and by the National Natural Science Foundation of China under Grant No. 11835005 and 11947227.
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Ovchynnikov, M., Zhu, JY. Search for the dipole portal of heavy neutral leptons at future colliders. J. High Energ. Phys. 2023, 39 (2023). https://doi.org/10.1007/JHEP07(2023)039
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DOI: https://doi.org/10.1007/JHEP07(2023)039