# Sterile Neutrinos and Supersymmetry

Just read a Scientific American review of a recent article which suggests evidence for sterile neutrinos:

http://www.nature.com/news/cosmic-mismatch-hints-at-the-existence-of-a-sterile-neutrino-1.14752

The article is a little unclear about exactly what evidence, but my question is more general. A sterile neutrino would certainly not necessarily imply a forth generation to the standard model - if memory serves there is some nice anomaly cancellation which would be ruined if we had four generations. I am mostly interested in what a sterile neutrinos would mean for supersymmetry - are they part of the MSSM? What is the minimal number of SUSY particles which must come along with such a neutrino? Do they HAVE to be SUSY, or can they be part of an extended SM?

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All true. Sterile neutrinos can be useful in eg mu from nu MSSM, $\mu\nu$MSSM because their scalar partner helps generate a $\mu$-term. –  innisfree Feb 21 '14 at 11:02