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The evidence for neutrino oscillations implies that three neutrino flavors(\nu_e, \nu_\mu, \nu_\tau) must have different mass states (\nu_1, \nu_2,\nu_3). The most popular idea of generating tiny masses of \nu_i is tointroduce three heavy Majorana neutrinos N_i (for i = 1, 2, 3) into thestandard model and implement the seesaw mechanism. In this approach theneutrino mixing matrix V appearing in the charged current interactions of \nu_iis not unitary, and the strength of unitarity violation of V is associated withthe matrix R which describes the strength of charged current interactions ofN_i. We present an explicit parametrization of the correlation between V and Rin terms of nine rotation angles and nine phase angles, which can be measuredor constrained in the precision neutrino oscillation experiments and byexploring possible signatures of N_i at the LHC and ILC. Two special but viablescenarios, the Type-I seesaw model with two heavy Majorana neutrinos and theType-II seesaw model with one heavy Majorana neutrino and one Higgs triplet,are taken into account to illustrate the simplified V-R correlation. Theimplications of R \neq 0 on the low-energy neutrino phenomenology are alsodiscussed. In particular, we demonstrate that the non-unitarity of V ispossible to give rise to an appreciable CP-violating asymmetry between \nu_\mu-> \nu_\tau and \bar{\nu}_\mu -> \bar{\nu}_\tau oscillations with short ormedium baselines.

Correlation between the Charged Current Interactions of Light and Heavy Majorana Neutrinos