Measuring up: an electron scattering experiment yields a small proton radius. (Courtesy: Jefferson Lab) For nearly a decade the size of the particle that makes up the bulk of the universe’s visible ...

Editor’s Note: After this article was published, Horbatsch and colleagues discovered an error in their analysis, which weakened the conclusions. The new calculation ...

Nash, L. (2026) On the Size of the Electron in a Quantum Universe. Journal of High Energy Physics, Gravitation and Cosmology, 12, 267-275. doi: 10.4236/jhepgc.2026.121017 .

Using the first new method in half a century for measuring the size of the proton via electron scattering, scientists have produced a new value for the proton's radius in a new experiment. Using the ...

The PRad physics experiment studies how electrons scatter off of protons A scientific tug-of-war is underway over the size of the proton. Scientists can’t agree on how big the subatomic particle is, ...

How do you measure the width of a proton? A ruler won’t help and neither will a microscope. Instead, it involves smashing electrons into protons at nearly the speed of light, then measuring how far ...

Quantum electrodynamics (QED) stands as one of the most rigorously tested theories in modern physics, offering a comprehensive framework to describe the interactions between charged particles and the ...

Puzzling protons: Alexey Grinin and Dery Taray working on the vacuum system of the 1S-3S experiment at the Max Planck Institute for Quantum Optics. (Courtesy: MPQ) A new and extremely precise ...