# Is it possible to measure the radius of an elementary particle?

The only way to describe the electron radius that I found in literature is the "classical electron radius". Is it possible to experimentally measure this? Is there a better way to describe the electron size (and in general, the size of any other elementary particle)?

The measurement can only be done if the de Broglie wavelength of the particles you are scattering is smaller than the size of your target. Since $\lambda = h/p$ this means really small objects can only be measured by using very high momentum and therefore very high energy. The reason I mention this is that at the energies we can currently reach (8TeV at the LHC) all the fundamental particles appear to be pointlike i.e. their radius is zero. Composite particles like protons and mesons (both made from quarks) have a non-zero radius but the quarks themselves appear to be point like.