The solar neutrino problem and nonstandard electroweak model

The nonstandard electroweak model might solve the solar neutrino problem existing for longer than two decades. Neutrinos of three flavors might oscillate to transform each other. However, this requires neutrino to have a limited small mass and therefore brings a weighty and exciting change to the particle physics. The new neutrino experiments may be now finding evidence of the neutrino oscillations