As physicists know, electrons, W and Z particles have masses, but neutrinos and photons do not. I wonder somehow that it could be for some reason that neutrinos, and even photons do have masses so small which they have escaped any sort of detection so far. Though, I think these masses if they do exist would be quite different from the masses of electrons and W and Z particles, that is how not what would or should be expected if the symmetry among these particles were so manifest in nature.


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