Neutrino 2-3 symmetry and inverted hierarchy

Neutrino oscillation data indicate the presence of a 2-3 symmetry for the left-handed neutrinos. We show that this symmetry between the second and third generations cannot be extended to include the charged leptons, no matter what basis we use. We point out that if this symmetry is also independently valid for the right-handed neutrinos, then the active neutrino spectrum is inverted, with m(3) = 0. This conclusion remains valid even when the left-handed 2-3 symmetry is broken by a nonmaximal atmospheric mixing angle theta(23), or a nonzero reactor angle theta(13). As previously shown by Mohapatra, Nasri, and Yu, such a symmetry also gives rise to interesting consequences on the leptogenesis asymmetry parameter epsilon(1).