Chiral Algebra, Chiral Breakdown, and ξ Parameter of K_{l3} Decay
Abstract
Using hardmeson current algebra with single meson dominance of currents and the σ commutator, it is deduced that (a) the 0^{+/} mesons must occur in nonets, and (b) 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 currentalgebra constraints. However, the large experimental ξ can be obtained by including additional nonpole (1,8)⊕(8,1) breaking terms.
 Publication:

Physical Review Letters
 Pub Date:
 January 1971
 DOI:
 10.1103/PhysRevLett.26.104
 Bibcode:
 1971PhRvL..26..104A