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19] H. M. R. Holstein, editors; Springer, 1995. [20] S. Weinberg, Phys. Rev. Lett. 17 (1966) 616. [21] S. Weinberg, Nucl. Phys. B363 (1991) 3. [22] E. Jenkins and A. Manohar, Nucl. Phys. B368 (1992) 190. [23] J. E. Sanio, and A. Svarc, Nucl. Phys. B307 (1988) 779. [24] V. Thorsson and A. Wirzba, Nucl. Phys. A589 (1995) 633. E. H. Lee, M. Rho, and V. Thorsson, Nucl. Phys. A567 (1994) 937. B. E. Nelson, Phys. Lett. B175 (1986) 57. E. B. Kaplan, Phys. Lett. B192 (1987) 193. E. Brown, V. Thorsson, K.

On the level of the expanded Lagrangian (156), the explicit breaking of chiral symmetry is introduced by an explicit pion mass term. Consequently corrections to the scattering 33 lengths due to the nucleon pole diagrams should be of the order of m2π , since two derivative ¯ µ τ ψ) · Φ × (∂ µ Φ) , which couplings are involved. However, the coupling δL = − 4f1 2 (ψγ π contributes to first order to the isospin-odd amplitude, should give rise to a term ∼ mf 2π π in agreement with our previous findings (126).

Furlan, and G. Rossetti, Currents in hadron physics, North-Holland, Amsterdam, 1973. [11] M. J. Oakes, and B. Renner, Phys. Rev. 175 (1968) 2195. [12] J. Gasser and H. Leutwyler, Phys. Rep. 87 (1982) 77. [13] T. Ericson and W. Weise, Pions and Nuclei, Clarendon Press, Oxford, 1988. [14] V. Bernard, N. G. Meissner, Phys. Lett. B309 (1993) 421. [15] S. Weinberg, Physica 96 A (1979) 327. [16] H. Leutwyler, Principles of chiral pertubation theory, In Proceedings of Hadron 94 Workshop, Gramado, Brazil 1994, hep-ph/9406283; World Scientific, 1995.

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