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The leading divergences contributing to the lowest-order electromagnetic and weak effective Lagrangians are characterized in terms of the bilocal operators that emerge from light-cone algebras. Possible mechanisms for finite mass differences are discussed in this context. Speculations concerning finite electromagnetic mass differences correlate the small nonelectromagnetic isospin violation with the approximate chiral SU(2) ×{} SU(2) symmetry of the strong-interaction Hamiltonian.
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Jackiw et al. (1972) studied this question.
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