ALGEBRA OF CURRENTS DIVERGENCE OF STRANGENESS-CHANGING VECTOR CURRENTS UNSUBTRACTED DISPERSION RELATIONS AND KL3 FORM FACTORS

On the basis of current algebra, the Nambu-Sakurai hypothesis of partial conservation of strangeness-changing vector currents, and unsubtracted dispersion relations for f+(q2) and q2f-(q2), the Kl3 parameters ξ, λ+, and λ- are found to be consistent with the present experimental indications. The only input in the theory is FKFπf+(0)=1.28 from the Cabibbo theory. The mass of the conjectured κ is in agreement with the recently reported result of broken chiral symmetry. © 1968 The American Physical Society.