Low-energy weak interactions are phenomenologically described in terms of an intrinsic part possessing a global SU(2) symmetry plus an additional electromagnetic correction. This description reconstructs the Weinberg-Salam SU(2) {} U(1) gauge-theory effective Lagrangian. Use of dispersion relations and Schwarz inequalities provides a lower bound on the range of the charged-current weak force, comparable to that obtained from gauge theories. The connection with the usual gauge-theory approach, especially the work of Georgi and Weinberg based on the group SU(2)U(1)G, is elucidated.
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James D. Bjorken (1979) studied this question.
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