Connecting bimaximal neutrino mixing to a light sterile neutrino

Details Connecting bimaximal neutrino mixing to a light sterile neutrino Connecting bimaximal neutrino mixing to a light sterile neutrino

2001-07-25

arxiv.org/abs/hep-ph/0107264v3

Phys.Rev. D64 (2001) 091301

Physics

High Energy Physics

High Energy Physics - Phenomenology

new references added; paper accepted for publication in Phys. Rev. D.(rapid communications); note added

Scientific paper

10.1103/PhysRevD.64.091301

It is shown that if small neutrino masses owe their origin to the conventional seesaw mechanism and the MNS mixing matrix is in the exact bimaximal form, then there exist symmetries in the theory that allow one of the righthanded neutrinos to become naturally massless, making it a candidate for the sterile neutrino discussed in the literature. Departures from the exact bimaximal limit leads to tiny mass for the sterile neutrino as well as its mixing to the active neutrinos. This provides a minimal theoretical framework where a simultaneous explanation of the solar, atmospheric and LSND observations within the so-called 3+1 scenario may be possible.

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