Neutrino masses: hierarchy without hierarchy

Details Neutrino masses: hierarchy without hierarchy Neutrino masses: hierarchy without hierarchy

2002-05-21

arxiv.org/abs/hep-ph/0205234v1

Acta Phys.Polon. B33 (2002) 1885

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, no figures. Dedicated to Stefan Pokorski on his 60th birthday. To appear in Acta Physica Polonica B

Scientific paper

A large hierarchy of the Dirac masses can result in a small hierarchy for the low energy masses of the active neutrinos. This can happen even if the Majorana masses of right-handed neutrinos are all equal. A realistic description of the observed neutrino masses and mixing can be obtained starting from a large hierarchy in the Dirac masses. A large mixing for solar neutrinos results from the neutrino sector. The small value of the MNS matrix element U_e3 is a natural consequence of the scheme. The masses of the two lighter neutrinos are related to the solar neutrino mixing angle: mu_1/mu_2 = tan^2 theta_sol.

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