eV Seesaw with Four Generations

Details eV Seesaw with Four Generations eV Seesaw with Four Generations

2005-12-21

arxiv.org/abs/hep-ph/0512278v2

Phys.Lett.B638:229-233,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Some minor corrections, 3 updated figures. Results and conclusions are mildly changed. To appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2006.05.011

We extend the eV seesaw scenario to four lepton generations. The LSND anomaly is taken as the right-handed seesaw scale, i.e. m_R ~ eV. The fourth generation then gives a heavy pseudo-Dirac neutrino which largely decouples from other generations, and is relatively stable. One effectively has a 3+3 solution to the LSND anomaly, where we illustrate with numerical solutions. Our study indicates that the third mixing angle sin^2(theta13) is likely less than 0.01.

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