Neutrino masses and mixings in nonfactorizable geometry
Abstract
We study bulk fermion fields in the localized gravity model with nonfactorizable metric recently proposed by Randall and Sundrum, and Gogberashvili. In addition to a tower of weakscale KaluzaKlein states we find a zero mode for any value of the fundamental fermion mass. If the fermion mass is larger than half the curvature of the compact dimension, the zero mode can be localized on the ``hidden'' 3brane in the RandallSundrum model. Identifying this mode with a righthanded neutrino provides a new way for obtaining small Dirac neutrino masses without invoking a seesaw mechanism. Cancellation of the parity anomaly requires introducing an even number of bulk fermions. This naturally leads to a strong hierarchy of neutrino masses and generically large mixing angles.
 Publication:

Physics Letters B
 Pub Date:
 February 2000
 DOI:
 10.1016/S03702693(00)00054X
 arXiv:
 arXiv:hepph/9912408
 Bibcode:
 2000PhLB..474..361G
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 15 pages, 1 figure