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Where to find experimental/theoretical value of (charge) radius of particles like proton, neutron, $pi^+$, etc. ?

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Try the Particle Data Group - this is a standard source for just about every measured property of every type of lepton, hadron and meson known.

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PDG doesn't have it. – qazwsx Nov 12 '11 at 19:25
I found $\pi^+$ charge radius instantly.… in the bottom of the page. – firtree May 12 '13 at 12:21

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