Chiral algebra, chiral breakdown, and ξ parameter of kl3 decay

Using hard-meson current algebra with single meson dominance of currents and the σ commutator, it is deduced that the 0± mesons must occur in nonets, and chiral symmetry is broken by only (3,3*)⊕(3*,3) terms (which then implies a small ξ parameter). Recent calculations which obtain a large negative ξ with only (3,3*) terms are seen to imply a violation of the current-algebra constraints. However, the large experimental ξ can be obtained by including additional nonpole (1,8)⊕(8,1) breaking terms

Duke Scholars

Author Morton Friedman Biomedical Engineering