Hello, I have a couple of questions that have been confusing me for a while: I read that quarks propagate as mass eigenstates, and that these are mixtures of the flavo eigenstates (superposition of the wave functions??), does this mean that baryons are the mass eigenstates of quarks? or does it mean that a free quark can exist as one flavor but be detected as another?? what exactly are mass eigenstates?? same questions go for neutrinos, Thanx!