What prerequisite for neutrino oscillation was confirmed, leading to the refinement of the Standard Model?

Answer

That neutrinos have mass.

The discovery that neutrinos have mass is a prerequisite for the phenomenon of oscillation, and this finding required a refinement of the Standard Model.

What prerequisite for neutrino oscillation was confirmed, leading to the refinement of the Standard Model?

#Videos

What is the role of neutrinos in stellar energy? - YouTube

starFusionparticleneutrinonuclear reaction