Heavy neutral leptons with masses of 2-3 GeV and mixing |U_μN|^2 = 10^{-6} can produce lepton-number violating B decays with branching ratios from 10^{-13} to 10^{-8}, with the largest signals in B_c^- → π^+ μ^- μ^-.
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Role of heavy neutral lepton in lepton number violating $B$ meson decays
Heavy neutral leptons with masses of 2-3 GeV and mixing |U_μN|^2 = 10^{-6} can produce lepton-number violating B decays with branching ratios from 10^{-13} to 10^{-8}, with the largest signals in B_c^- → π^+ μ^- μ^-.