See-saw mechanism and four light neutrino state
classification
✦ hep-ph
keywords
neutrinolightmasssee-sawformalfourfourthgiven
read the original abstract
A formal proof is given that in a see-saw type neutrino mass matrix with only two neutrino mass scales ($m_D \ll m_R$) and the maximal rank of $m_{R(D)}$, we can not get a fourth light sterile neutrino.
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