Sterile Neutrino as a Bulk Neutrino

Details Sterile Neutrino as a Bulk Neutrino Sterile Neutrino as a Bulk Neutrino

1999-10-25

arxiv.org/abs/hep-ph/9910474v2

Nucl.Phys.B576:466-478,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, no figures; minor typos corrected

Scientific paper

10.1016/S0550-3213(00)00081-X

If light sterile neutrinos are needed to understand the neutrino puzzles, as is currently indicated, a major theoretical challenge is to understand why its mass is so small. It is a more serious problem than understanding the small mass of the familiar neutrinos. We discuss a new way to solve this problem by identifying the sterile neutrino as gauge neutral fermion propagating in the bulk of a higher dimensional theory, with bulk size of order of a millimeter. The smallness of its mass is then a consequence of the size of the extra dimension and does not need the introduction of new symmetries. We present a realistic model for neutrino masses and mixings that implements this idea.

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