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Using the algebra of currents and the sum rules recently derived by Weinberg, we calculate the electromagnetic mass difference of pions and obtaim m^{+}-m^{0}5. 0 MeV.
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T. K. Das
Indian Institute of Technology Dhanbad
G. S. Guralnik
Northeastern University
V. S. Mathur
Virginia Tech
Physical Review Letters
University of Rochester
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Das et al. (Mon,) studied this question.
synapsesocial.com/papers/6a1bc18167ec8852715ed47c — DOI: https://doi.org/10.1103/physrevlett.18.759