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Physical Review D 62 (2000) 033003
Contributions of order O(M(QUARK)**2) K(LEPTON 3) form-factors and unitarity of the CKM matrix
Norman. H. Fuchs1, Marc Knecht2, Jan Stern3

The form factors for the K_{l 3} semileptonic decay are computed to order O(p^4) in generalized chiral perturbation theory. The main difference with the standard O(p^4) expressions consists in contributions quadratic in quark masses, which are described by a single divergence-free low-energy constant, A_3. A new simultaneous analysis is presented for the CKM matrix element V_{us}, the ratio F_K/F_{pi}, K_{l 3} decay rates and the scalar form factor slope lambda_0. This framework easily accommodates the precise value for $V_{ud}$ deduced from superallowed nuclear beta-decays.
1 :  Physics Departement
2 :  FRUMAM - Fédération de Recherche des Unités de MAthématiques de Marseille
3 :  IPNO - Institut de Physique Nucléaire d'Orsay
Physique/Physique des Hautes Energies - Phénoménologie
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