Flavor hierarchy in SO(10) grand unified theories via 5-dimensional wave-function localization

Details Flavor hierarchy in SO(10) grand unified theories via 5-dimensional wave-function localization Flavor hierarchy in SO(10) grand unified theories via 5-dimensional wave-function localization

2003-02-10

arxiv.org/abs/hep-ph/0302073v2

Phys.Rev. D67 (2003) 116004

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 1 figure, references added

Scientific paper

10.1103/PhysRevD.67.116004

A mechanism to generate fermion-mass hierarchy in SO(10) Grand Unified Theories is considered. We find that the lopsided family structure, which is suitable to the Large angle MSW solution to the solar neutrino oscillation, is realized without introducing extra matter fields if the hierarchy originates from the wave-function profile in an extra dimension. Unlike the Froggatt-Nielsen mechanism, the SO(10) breaking effect may directly contribute to the source of the hierarchy, i.e., the bulk mass terms. It naturally explains the difference of the hierarchical patterns between the quark and the lepton sectors. We also find the possibility of the horizontal unification, in which three generations of the matter fields are unified to a 3 dimensional representation of an SU(2) gauge group.

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