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We perform a matching of the two loop-chiral perturbation theoryrepresentation of the scalar Kpi form factor to a dispersive one. Knowing thevalue of F_K/F_pi and f_+(0) in the Standard Model (SM) allows to determine twoO(p^6) LECs, the slope of the scalar form factor and the deviation of theCallan-Treiman theorem. Going beyond the SM and assuming the knowledge of theslope of the scalar form factor from experiment, the matching allows us todetermine the ratio of F_K/F_pi, f_+(0), a certain combination of non-standardcouplings, the deviation of the Callan-Treiman theorem and the two O(p^6) LECs.

Matching Chiral Perturbation Theory and the Dispersive Representation of the Scalar Kpi Form Factor