Two scales in neutrino physics
  The problem of neutrino mass origin is considered on the phenomenological level. The assumption is made that the neutrino mass values depend on two dominant contributions with their characteristic scales. The neutrino mass values as well as the values of the neutrino mass observables m_C, m_{\beta}, m_{2\beta} and the CP-phase {\delta} are estimated. 
V. V. Khruschov
hep-ph