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Using the published KTeV samples of K_L --> pi^{\pm} e^{\mp} nu and K_L -->pi^{\pm} mu^{\mp} nu decays [1], we perform a reanalysis of the scalar andvector form factors based on the dispersive parameterization [2,3]. We obtainphase space integrals I^e_K = 0.15446 \pm 0.00025 and I^{mu}_K = 0.10219 \pm0.00025. For the scalar form factor parameterization, the only free parameteris the normalized form factor value at the Callan-Treiman point (C); our bestfit results in ln C = 0.1915 \pm 0.0122. We also study the sensitivity of C todifferent parametrizations of the vector form factor. The results for the phasespace integrals and C are then used to make tests of the Standard Model.Finally, we compare our results with lattice QCD calculations of F_K/F_pi andf_+(0).

Dispersive analysis of K_{L mu3} and K_{L e3} scalar and vector form factors using KTeV data