A proton’s core consists of three valence quarks, but they contribute only a small fraction of the proton's mass. Most of the mass emerges from intricate quark dynamics and is primarily ...

Nuclear physicists may have finally pinpointed where in the proton a large fraction of its mass resides. A recent experiment has revealed the radius of the proton's mass that is generated by the ...

“There’s a lot of meanings for ‘small,’” says Janet Conrad, a particle physicist at the Massachusetts Institute of Technology ...

It's the opposite. The Higgs field is responsible for the masses of the up and down quarks inside a proton or neutron, which accounts for only about 1% of a proton's or neutron's mass.

In the beginning, says one school of cosmology, there was "ylem"*: a featureless mass of protons and neutrons containing all the matter in the universe. A little later (perhaps during the ...