We report on a search for heavy neutrinos in B-meson decays. The results are
obtained using a data sample that contains 772x10^6 BB-bar pairs collected at
the Upsilon(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/c^2.
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