Probability of a Solution to the Solar Neutrino Problem Within the   Minimal Standard Model
  Tests, independent of any solar model, can be made of whether solar neutrino experiments are consistent with the minimal Standard Model (stable, massless neutrinos). If the experimental uncertainties are correctly estimated and the sun is generating energy by light-element fusion in quasi-static equilibrium, the probability of a standard-physics solution is less than 2%. Even when the luminosity constraint is abandoned, the probability is not more than 4%. The sensitivity of the conclusions to input parameters is explored. 
Karsten M. Heeger and R. G. H. Robertson (Nuclear Physics Laboratory,   University of Washington)