After years of confusion, a new study confirms the proton is tinier than once thought. That enables a test of the standard model of particle physics.

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 ...

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 ...

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, ...

Scientists at Jefferson Lab in Virginia have precisely measured an important and innate property of the ubiquitous proton for the first time, according to a new paper. The proton property, called its ...

The weak charge of the proton has been measure to high-precision for the first time. The work was done at the Thomas Jefferson National Accelerator Facility (Jefferson Lab) in Virginia and the result ...