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"Particle," not "partical." The leptons (electrons, muons, taus, and their neutrinos) and quarks are considered pointlike entities in the Standard Model. That is, they have zero size, just quantum properties (charge, mass, etc.).
Experimentally, the best limit we have is on the charge radius of the electron, which is known to be less than 10^-22 m [Dehmelt 1988]. From deep inelastic scattering experiments at SLAC and DESY, we have similar limits (< 10^-20 m) on the charge radii of quarks.
You can find out a lot of this from Wikipedia, or from the articles included in the Review of Particle Properties (http://pdg.lbl.gov/).
Posted:Feb 17, 2015
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