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Dirac or Majorana: Higgs-$Z^\prime$ probe to investigate neutrino nature

ShivaSankar K.A.Arindam DasKei Yagyu
Feb 2024
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摘要原文
We propose a novel approach to determine one of the most important properties of neutrinos, namely, a Dirac or Majorana particle in a scenario with a new $U(1)_X$ gauge symmetry. In this scenario, three right-handed neutrinos are inevitably introduced due to the gauge anomaly cancellations. We find that the decay branching ratio of the discovered Higgs boson into a pair of new massive gauge bosons ($Z'$) can significantly be enhanced in the Dirac neutrino case as compared with the Majorana case for a fixed value of the new gauge coupling and the mass of $Z'$ under constraints from current experimental data. Because of such an enhancement, the Dirac case can indirectly be tested via the Higgs decay in addition to the absence of neutrinoless double-beta decays.
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