The Pionic Proof Of The Precise Down Up Quark Mass Differential

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For a number of years now the Particle Data Group (http://pdg.lbl.gov) has listed the measured mass difference between the charged and neutral pions as being equal to 4.5936 (with an experimental uncertainty = .0005) MeV. While this mass-difference is attributed to the added electric component of the charged state, one theoretically can equivalently derive the […]