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We report on a search for heavy neutrinos in B-meson decays. The results are obtained using a data sample that contains 772×10⁶BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider. No signal is observed and upper limits are set on mixing of heavy neutrinos with left-handed neutrinos of the Standard Model in the mass range 0.5--5.0 GeV/c².
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Liventsev et al. (2013) studied this question.
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