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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 http://pdg.lbl.gov/ - this is a standard source for just about every measured property of every type of lepton, hadron and meson known.

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  • $\begingroup$ PDG doesn't have it. $\endgroup$
    – qazwsx
    Commented Nov 12, 2011 at 19:25
  • $\begingroup$ I found $\pi^+$ charge radius instantly. pdglive.lbl.gov/… in the bottom of the page. $\endgroup$
    – firtree
    Commented May 12, 2013 at 12:21

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