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Hard-pion techniques are presented for calculating vertex functions involving π, ρ, A₁, and σ mesons. The development of the method involves the following assumptions: (a) saturation of intermediate sums by single mesons, (b) chiral SU(2)×SU(2) algebra commutation relations, (c) conservation of vector current, and (d) partial conservation of axial-vector current.
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Arnowitt et al. (1968) studied this question.
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