Abstract
It is assumed that a heavy right-handed Majorana neutrino (or more) which is a weak SU(2) singlet exists and its mixing with regular neutrinos causes a Cabibbo-Kobayashi-Maskawa-type matrix. This mixing effect may interpret some problems in {tau} leptonic decays. To be consistent with the requirements from both the seesaw mechanism and data on {ital Z}{sup 0} decay, the fourth generation with a heavy neutrino is needed. This also possibly provides a large destructive interference between contributions of magnetic moments of the electron neutrino and {tau} neutrino to explain away the puzzle about the deficiency of the solar-neutrino flux.
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