A proton’s valence quarks (blue, red, and green), quark-antiquark pairs, and gluons (springs). Scalar gluon activity (pink) extends beyond the electric charge radius (orange) that surrounds the ...

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 ...

The quarks that give it charge aren't hanging out with the gluons that provide mass.

For the first time, by studying quantum correlations between triplets of secondary particles created during high-energy ...