An Updated Numerical Analysis of eV Seesaw with Four Generations

Understand

We consider the so-called "eV seesaw" scenario, with right-handed Majorana mass $M_R$ at eV order, extended to four lepton generations.

• The fourth generation gives a heavy pseudo-Dirac neutral lepton, which largely decouples from other generations and is relatively stable.
• The framework naturally gives 3 active and 3 sterile neutrinos.
• We update a previous numerical analysis of a 3+3 study of the LSND anomaly, taking into account the more recent results from the MiniBooNE experiment.