Abstract
The concept of the mass in (QCD) was discussed. The Schwarzschild radii and the Compton wave length of different types of quarks have been found. The comparison between the Schwarzschild radii with the proton and neutron radii shows that the quarks behave like a point particle inside the nucleon. It is found that the Compton wave lengths of the up and down quarks are of the order of the nucleon radii.
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