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Higher-dimensional models of neutrino physics with one or more right-handedneutrinos in the bulk have attracted considerable attention in recent years.However, a critical issue for such models is to find a way of introducing therequired flavor dependence needed for generating neutrino oscillations. In thispaper, we point out that a natural ``minimal'' framework that accomplishes thiscan be constructed by combining the bulk-neutrino hypothesis for right-handedneutrinos with the split-fermion scenario for left-handed neutrinos. Thiscombination leads to a unique flavor signature for neutrino phenomenology whicheasily incorporates large flavor mixing angles. This hybrid scenario also has anumber of additional important features. For example, one previous difficultyof the split-fermion scenario applied to neutrinos has been that the massmatrix is exponentially sensitive to neutrino displacements within the brane.However, in our hybrid scenario, the interactions between the brane and bulknaturally convert this dependence from exponential to linear. Another importantfeature is that our hybrid scenario provides its own natural regulator forKaluza-Klein sums. Thus, in our scenario, all Kaluza-Klein summations aremanifestly finite, even in cases with multiple extra dimensions. But mostimportantly, our mechanism completely decouples the effective neutrino flavormixing angles from the sizes of the overlaps between the neutrino wavefunctionswithin the brane. Thus, we are able to obtain large neutrino mixing angles evenwhen these neutrinos have significant spatial separations and their overlapsvanish.Comment: 11 pages, LaTeX, 1 figur

Hybrid model of neutrino masses and oscillations: Bulk neutrinos in the split-fermion scenario