An explanation of the "negative neutrino mass squared" anomaly in   tritium $ \beta$-decay based on a theory of mass
  A proposed solution of the anomalous behavior of the electron spectrum near the endpoint of tritium $\beta$-decay is offered. It is based on a new theory of mass in which mass becomes a dynamical variable, and the electron in the tritium $\beta$-decay has a narrow mass distribution. The predicted Kurie plots explain the main feature (``$m_{\nu}^2 < 0 $'') of this anomalous behavior. 
R.L. Ingraham, G.A.Luna-Acosta, and J.M. Wilkes