Large Mixing from Small: Pseudo-Dirac Neutrinos and the Singular Seesaw

Details Large Mixing from Small: Pseudo-Dirac Neutrinos and the Singular Seesaw Large Mixing from Small: Pseudo-Dirac Neutrinos and the Singular Seesaw

2004-04-02

arxiv.org/abs/hep-ph/0404015v1

Int.J.Mod.Phys.A20:6373-6390,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

26pp., 3 figs., revtex4; extension of hep-ph/0307245

Scientific paper

10.1142/S0217751X05028466

If the sterile neutrino mass matrix in an otherwise conventional seesaw model has a rank less than the number of flavors, it is possible to produce pseudo-Dirac neutrinos. In a two-flavor, sterile rank 1 case, we demonstrate analytic conditions for large active mixing induced by the existence of (and coupling to) the sterile neutrino components. For the three-flavor, rank 1 case, ``3+2'' scenarios with large mixing also devolve naturally as we show by numerical examples. We observe that, in this approach, small mass differences can develop naturally without any requirement that masses themselves are small. Additionally, we show that significant three channel mixing and limited experimental resolution can combine to produce extracted two channel mixing parameters at variance with the actual values.

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