Aspects of chiral symmetry by Koch V.

By Koch V.

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The cancelation between the large individual contributions to the isospin-even amplitude is a direct consequence of chiral symmetry, which required the σ-exchange diagram. e. the isospin-even scattering amplitude vanishes identically, because the corrections ∼ mπ are zero in this case. Furthermore, since the third diagram (c) does not contribute to the isospin-odd amplitude, the good agreement found above still holds. In other words, with the ‘help’ of chiral symmetry both amplitudes are reproduced well.

Phys. B321 (1989) 387. G. M. Levin, Nucl. Phys. A511 (1990) 679. D. J. K. Griegel, Phys. Rev. C45 (1992) 1881. Q. Li and C. M . Ko, Phys. Lett. B388 (1994) 118. [39] R. Brockmann and W. Weise, The chiral condensate in matter, In Proceedings of the Interanational Workshop on Hadrons in Nuclear Matter, Hirschegg 1995, H. Feldmeier and W. N¨orenberg, editor, volume XXIII, page 12, 1995. [40] M. L. L. Ioffe, Phys. Lett. B252 (1990) 620. [41] C. Song, Phys. Rev. D48 (1993) 1375. [42] C. Song, Phys. Rev.

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