Abstract
The Higgs boson can mix with a singlet scalar that dynamically generates the Majorana mass of the right-handed neutrino NR. We show that even a tiny mixing between the Higgs boson and a ‘decoupled’ singlet scalar allows for Higgs-mediated pair production of NR without significant mixings between the active neutrinos and NR, and thus testable at colliders via a characteristic signal of two same-sign same-flavor lepton pairs, plus missing energy. We demonstrate that this search channel is mostly background- free in pp-collision and can be a highly sensitive probe of the Higgs-singlet mixing at the current and future pp colliders. Such channel provides a clean signal to discover the singlet scalar and explore the origin of neutrino masses.
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Gao, Y., Jin, M. & Wang, K. Probing the decoupled seesaw scalar in rare Higgs boson decay. J. High Energ. Phys. 2020, 101 (2020). https://doi.org/10.1007/JHEP02(2020)101
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DOI: https://doi.org/10.1007/JHEP02(2020)101