Unanswered Questions

Beyond the Proton, Neutron, and Electron

Do the masses of the quarks add up to the mass of the proton?

The mass of two up quarks and one down quark sum to 8.81 MeV/c2, and gluons are massless, but the proton’s mass is 938 MeV/c2. How can that be? The remainder of the mass is due to the high energies of the quarks and gluons within the proton.

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