Matching chiral perturbation theory and the dispersive representation of the scalar Kπ form factor

We perform a matching of the two loop-chiral perturbation theory representation of the scalar K pi form factor to a dispersive one. Knowing the value of F-K/F-pi and f(+)(0) in the Standard Model (SM) allows to determine two O(P-6) LECs, the slope of the scalar form factor and the deviation of the Callan-Treiman theorem. Going beyond the SM and assuming the knowledge of the slope of the scalar form factor from experiment, the matching allows us to determine the ratio of F-K/F-pi, f(+)(0), a certain combination of non-standard couplings, the deviation of the Callan-Treiman theorem and the two O(p(6)) LECs. (C) 2008 Elsevier B.V. All rights reserved.