Abstract
Under reasonable assumptions we derive from the proton electromagnetic form factors those of the quark vector currents separately. Then we deduce the quark radii and magnetic moments in the proton and find a surprisingly large strangeness contribution. Using a constituent quark model, we relate the quark magnetic moments to the spin of the proton and confirm previous conclusions that it is not carried completely by quarks. If we extend the role of s-quarks in the proton to the SU(3) F octet then we predict the magnetic moments of the other baryons.
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