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Experimental measurements show that the proton's electric form factor
equals its magnetic form factor [1]. This equality indicates that
both form factors represent quarks' form factor. Thus, an appropriate
Fourier transform proves that the radial dependence of the
proton's quark density
decreases exponentially [1]. This density formula is the same as that of the
electron in the hydrogen atom, where the state is determined by
a Coulomb attraction. This result is compatible with the hadronic
structure based on the regular charge-monopole theory. Indeed,
according to this theory, quarks,
that carry a monopole unit are attracted to the baryonic core by a
Coloumb-like force. On the other hand, the exponential decrease
of quark density is
inconsistent with QCD's
"Asymptotic Freedom" where the attractive force tends to zero for a
quark-quark vanishing distance.
References:
[1] D. H. Perkins, Introduction to High Energy Physics
(Addison-Wesley, Menlo Park,1987). pp. 194-197.
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