View Single Post
Oct7-10, 11:38 PM
Sci Advisor
PF Gold
P: 5,027
In one account of the new findings of smaller proton radius, the claim was repeated several times that the radius of a proton was predicted by QED, in conflict with the new measurement. Why QED? I would think, within a proton, QCD is orders of magnitude more important. Of course the quarks are charged, but why would QED dominate?

Thanks for any explanation.
Phys.Org News Partner Physics news on
Refocusing research into high-temperature superconductors
Neutron tomography technique reveals phase fractions of crystalline materials in 3-dimensions
Tiny magnets, huge fields: Nanoscale ferromagnetic electrodes create chemical equivalent of solid-state spin valve