Zhang, H (reprint author), AlbaNova Univ Ctr, Royal Inst Technol, KTH, Dept Theoret Phys,Sch Engn Sci, Roslagstullsbacken 21, S-10691 Stockholm, Sweden.
We propose a simplified version of the inverse seesaw model, in which only two pairs of the gauge-singlet neutrinos are introduced, to interpret the observed neutrino mass hierarchy and lepton flavor mixing at or below the TeV scale. This "minimal" inverse seesaw scenario (MISS) is technically natural and experimentally testable. In particular, we show that the effective parameters describing the non-unitary neutrino mixing matrix are strongly correlated in the MISS, and thus, their upper bounds can be constrained by current experimental data in a more restrictive way. The Jarlskog invariants of non-unitary CP violation are calculated, and the discovery potential of such new CP-violating effects in the near detector of a neutrino factory is discussed. (C) 2009 Elsevier B.V. All rights reserved.