Pseudo Dirac scenario for neutrino oscillations - art. no. 013003

We argue how the pseudo Dirac scenario for neutrinos leads to rich neutrino oscillation phenomena, including oscillation inside each generation. The p seudo Dirac scenario is generalized by incorporating generation mixings and formulas for the various neutrino oscillations are derived. As an applicat ion we compare the Formulas with the corresponding data. We find that the o bserved pattern of mixings, such as almost maximal mixing in the atmospheri c neutrino oscillation, is naturally explained in the generalized pseudo Di rac scenario with small generation mixings, We, however, also point our tha t there remain some problems to be settled for this scenario to be viable. The possible theoretical framework to realize the pseudo Dirac scenario is also briefly commented on.