Unanswered QuestionsBeyond 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.