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we deal with this question in the standard model? Jack points out that in a
later post that we don't even know what electric charge is.
charged
Finally we do have zero rest mass particles which carry color
charge (they are confined by this force) and we did not question a massless
neutrino with weak charge. Now we strongly suspect that neutrinos are not
massless. So perhaps we can redefine the question, must all zero mass
particles be confined, as Jack suspects?