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The radius of a proton is a more meaningful quantity than the radius of an electron, because as far as we know the electron is pointlike (no internal degrees of freedom) but a quark is a composite particle containing three quarks and so in principle one could assign it a radius just like the hydrogen atom - a composite particle of a proton and an electron can be assigned a radius by studying the electron wavefunction for its ground state.

Then again, the "radius" of a wavefunction, be it the electron orbital in an atom or the wf of a quark in the proton, is only meaningful as an order of magnitude anyway.

We have met the enemy, and he is us — Pogo

by Carrie (migeru at eurotrib dot com) on Fri Feb 22nd, 2008 at 03:22:25 PM EST
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