Chiral Symmetry, Nonleptonic Hyperon Decay, and the Feinberg-Kabir-Weinberg Theorem
We demonstrate that additional (kaon-pole) diagrams must be appended to the traditional commutator-plus-baryon-pole approach to nonleptonic hyperon decay. The modified analysis satisfied the constraints of the Feinberg-Kabir-Weinberg theorem. The new terms are not numerically significant in the case of the usual current-current Hamiltonian, in the continuum limit, but can be important for work using lattice techniques or for other Hamiltonians.
JF Donoghue and BR Holstein. "Chiral Symmetry, Nonleptonic Hyperon Decay, and the Feinberg-Kabir-Weinberg Theorem" Physical Review D 33.9 (1986): 2717-2719.
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