Search for heavy neutrinos at Belle

Abstract

We report on a search for heavy neutrinos in B-meson decays. The results are obtained using a data sample that contains 772×106B???Bpairs 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?5.0GeV/c2